A division of GYMNOSPERMS which look like palm trees (ARECACEAE) but are more closely related to PINUS. They have large cones and large pinnate leaves and are sometimes called cycads, a term which may also refer more narrowly to cycadales or CYCAS.

High levels of genetic variability and inbreeding in two Neotropical dioecious palms with contrasting life histories. (1/7)

We characterized the population genetics of two Neotropical dioecious palm species of Chamaedorea with contrasting life strategies from the region that is both the northernmost extent and most species rich of the genus. Chamaedorea tepejilote is a common, wind-pollinated arboreal understory palm. Although most adult plants reproduce each year, only a few individuals produce the majority of flowers and seeds. Chamaedorea elatior, conversely, is an uncommon climbing subcanopy palm with entomophilous flowers (insect-pollinated characteristics). Most of the mature palms do not reproduce in consecutive years and fruiting is episodic. Isozymes with a total of 107 alleles for 27 loci of 17 enzymes from six populations were assessed. For both species, co-occurrence of high levels of genetic variation and homozygosity was observed (C. tepejilote: He: 0.385-0.442, f: 0.431-0.486; C. elatior: He: 0.278-0.342, f: 0.466-0.535). Genetic differentiation of C. elatior was much lower (theta=0.0315) than that for C. tepejilote (theta=0.152). The contrast in differentiation may be influenced by differences in the spatial scale of the genetic neighborhoods of the two species. The simultaneous maintenance of inbreeding and of a large number of alleles within the populations is attributable to the low and variable number of mating pairs. Demographic studies indicate that this pattern could be explained by low reproductive frequency among individuals and over years in C. elatior and by reproductive dominance in C. tepejilote.  (+info)

DNA barcoding in the cycadales: testing the potential of proposed barcoding markers for species identification of cycads. (2/7)

Barcodes are short segments of DNA that can be used to uniquely identify an unknown specimen to species, particularly when diagnostic morphological features are absent. These sequences could offer a new forensic tool in plant and animal conservation-especially for endangered species such as members of the Cycadales. Ideally, barcodes could be used to positively identify illegally obtained material even in cases where diagnostic features have been purposefully removed or to release confiscated organisms into the proper breeding population. In order to be useful, a DNA barcode sequence must not only easily PCR amplify with universal or near-universal reaction conditions and primers, but also contain enough variation to generate unique identifiers at either the species or population levels. Chloroplast regions suggested by the Plant Working Group of the Consortium for the Barcode of Life (CBoL), and two alternatives, the chloroplast psbA-trnH intergenic spacer and the nuclear ribosomal internal transcribed spacer (nrITS), were tested for their utility in generating unique identifiers for members of the Cycadales. Ease of amplification and sequence generation with universal primers and reaction conditions was determined for each of the seven proposed markers. While none of the proposed markers provided unique identifiers for all species tested, nrITS showed the most promise in terms of variability, although sequencing difficulties remain a drawback. We suggest a workflow for DNA barcoding, including database generation and management, which will ultimately be necessary if we are to succeed in establishing a universal DNA barcode for plants.  (+info)

Differential patterns of evolution and distribution of the symbiotic behaviour in nostocacean cyanobacteria. (3/7)

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The cycad genotoxin MAM modulates brain cellular pathways involved in neurodegenerative disease and cancer in a DNA damage-linked manner. (4/7)

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Recent synchronous radiation of a living fossil. (5/7)

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Thrips pollination of Mesozoic gymnosperms. (6/7)

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Chloroplast phylogenomics indicates that Ginkgo biloba is sister to cycads. (7/7)

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1, fertilization 7 days to 12 months or more after pollination, to ca 2 mm from receptive surface to egg; seeds large [ca 8 mm3], but not much bigger than ovule, with morphological dormancy; testa mainly of coloured sarcoexotesta, scleromesotesta, and ± degenerating endotesta; first zygotic nuclear division with chromosomes of male and female gametes lining up on separate but parallel spindles, embryogenesis initially nuclear, embryo ± chlorophyllous; gametophyte persists in seed; plastid and mitochondrial transmission paternal; genome size [1C] 10< pg [1 pg = 109 base pairs]/(2201-)17947(-35208) Mb; two copies of LEAFY gene [LEAFY, NEEDLY] and three of the PHY gene, [PHYP [PHYN + PHYO]], chloroplast IR expanded, with duplicated ribosomal RNA operons, second intron in the mitochondrial rps3 gene [group II, rps3i2]. 4 orders, 13 families, 1,058 species.. Age. This clade may be (382-)366(-344) Ma (Won & Renner 2006), ca 353.9 Ma (Y. Lu et al. 2014), 337-308.5 Ma (Morris et al. 2018), ...
The plants have woody, columnar, unbranched stems with a crown of large, pinnately compound leaves, which make it look like a palm tree. Mucilage canals are present in the pith and cortex, and the...
Afidi, i blisko srodni adelgidi i filokserani, verovatno su se razvili iz zajedničkog pretka, pre oko 280 miliona godina, u ranom permskom periodu.[8] Verovatno su se hranili biljkama poput Cordaitales ili Cycadophyta. Sa svojim mekim telima afidi se dobro ne fosiliziraju, te je najstariji poznati fosil je vrste Triassoaphis cubitus iz trijasa.[9] Međutim, oni se ponekad zaglave u biljnim eksudatima koji se okvršćavaju u jantar. Godine 1967, kada je profesor Ole Heje napisao svoju monografiju Studije o fosilnim afidima, opisano je oko šezdeset vrsta iz perioda trijasa, jure, krede i uglavnom tercijarnih perioda, a baltički ćilibar je pridoneo još četrdeset vrsta.[10] Ukupan broj vrsta bio je mali, ali je znatno porastao pojavom skrivenosemenica pre 160 miliona godina, jer je to omogućilo da se listne uši specijaliziraju. Specifikacije lisnih uši su išle ruku pod ruku sa diverzifikacijom cvetajućih biljaka. Najranije listne uši su verovatno bile polifagne, dok su se monofagne ...
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To protect the Amami rabbit, a living fossil, Japanese officials are using TNR rather than mass killing. Other nations should take notice.. ...
Get information, facts, and pictures about living fossil at Encyclopedia.com. Make research projects and school reports about living fossil easy with credible articles from our FREE, online encyclopedia and dictionary.
A living Shovelnose Ray is identical to a Jurassic fossil ray, a living fossil, bringing into question both evolution and geological time.
The chambered nautilus is the largest species of nautilus and is considered a living fossil, as it has remained unchanged for the past 500 million years!
We know the coelacanth as a fish that hasnt changed in millions of years, that was thought to be extinct. The creature itself is fascinating, but the story of how it was discovered in 1938 is also an interesting tale, told in a papercraft animation from BioInteractive. -via Nag on the Lake...
The horseshoe crab is considered one of the relatively few living fossils on Earth, given that its been around for 450 million years. But this prehistoric-looking, helmet-shaped invertebrate
Cycadophyta : - Cycadophyta: There are approximately 350 species of plants in this division which, by the shape of their trunks and leaves, remind palm trees but they have nothing to do with them. It is believed that they already existed about 300 million years ago, but only some remains have been found dating 230 million years ago. They are very old trees that were very abundant in the Jurassic. Today you can find them in the wild in Southeast Asia, Southeast Africa, and Southeast Australia, Central America, Florida and the Caribbean countries. Among the trees included we can mention three families of cycads (Cycadeceae), such as Cycas revoluta, the zamias (Zamiaceae), a family containing the Encephalartos, such as Encephalartos horridus. The third family is the Stangeriaceae, within which there are two genders Stangeria and Bowenia. - Ginkgophyta: - Gingkgophyta: The ginkgo is the sole representative of this division of gymnosperms. It is a dioecious tree, meaning that there are male trees and ...
Cycad fruit. Close-up of the developing fruit of the cycad (Lepidozamia peroffskyana). Cycads are a primitive family of plants which have remained virtually unchanged for over 300 million years. They are slow-growing fern-like trees which produce these large fruits bearing the seeds. The fruits of this species may weigh as much as 40 kilograms when fully mature. Cycads are now rare in nature, and only inhabit tropical and sub- tropical areas. They are considered to be the most primitive of the gymnosperms (seed-bearing plants). Photographed in Melbourne Botanic Gardens, Australia. - Stock Image B500/0109
Going as far back as the dinosaurs, cycad plants are great for all gardeners. These plants add interest both indoors and out. Learn more about growing cycads in this article.
Ive mentioned cycads elsewhere on this site, and I suspected that there would be a lot of people out there who have no idea what a cycad is. You may have ...
MORETTI, A. (Dipartimento di Biologia vegetale, Facolta di Scienze, Universita di Napoli, via Foria 223, Napoli, Italy) Cytotaxonomy of cycads. Memoirs of The New York Botanical Garden 57: 114â€122. 1990. Nine genera of cycads have been examined from a cytotaxonomic point of view. Karyotypic data, most of which are newly described, are figured and discussed from a phylogenetic point of view. Robertsonian changes, which involve centric fission or fusion, chromosome loss and chromosome deletion, are proposed to explain karyotype differentiation in Zamia, the only genus with interspecific chromosome variation. On the basis of these mechanisms, a scheme showing the evolution of karyotypes in Zamia is presented. The scheme appears realistic enough even though it does not show correlation with morphological and taxonomic characters of Zamia species. Two cases of infraspecific chromosome variation; Z. roezli with 2n = 22, 24, 25, 26 and Z. paucijuga with 2n = 19, 23, 24, 25, 26, 27, 28, are also ...
Meerow, A.W., Salas-Leiva, D., Calonje, M., Ortega, J.F., Griffith, M., Nakamura, K., Jimenez-Rodriguez, F., Lawrus, J., Oberli, A. 2018. Contrasting demographic history and population structure of Zamia (Cycadales: Zamiaceae) on five islands of the Greater Antilles suggests a model for population diversification in the Caribbean clade of the genus. International Journal of Plant Sciences. 179:730-757 ...
Cycads are often used in a decorative role in gardens. However, consuming any part of the plant can prove extremely poisonous to many types of animal, including cats. - Wag! (formerly Vetary)
Collector of TOP cycad and Encephalartos species.. Encephalartos and Cycas Seeds and seedings vailable for the following species. Bulk suppliers of Top Africa medicinal Herbs/plants White Pepper E-mail us if interested in any of the above products: camcycads (a) gmail. com
Garden tour: Living Fossils at Point Defiance Zoo & Aquarium. Take a tour of our landscape with a horticulturalist, and learn about Jurassic era plants.
Welcome to the famous Daves Garden website. Join our friendly community that shares tips and ideas for gardens, along with seeds and plants.
Im a translator and writer currently living in Finland. I have three academic degrees: a BA in Bible and Theology, an MA in Translation Studies, and an MA in Biblical Studies. Olen koulutukseltani sekä filosofian maisteri (pääaine: englannin kielen kääntäminen ja tulkinta) että teologian maisteri (Uuden testamentin koulutusohjelma). Lisäksi olen suorittanut BA-tutkinnon (Raamattu ja teologia ...
With 500 million years of evolution behind it, the nautilus has coped with mass extinctions, jet propulsion and even mazes. We are more of a challenge
Last month we reported on the first people who, around twelve thousand years ago, were lining their loved ones graves with flowers. This month, we have a piece on the extinct frog that was resurrected and then discovered to be a living fossil. Both of these studies were led by Israeli researchers from other institutions.…. ...
Last month we reported on the first people who, around twelve thousand years ago, were lining their loved ones graves with flowers. This month, we have a piece on the extinct frog that was resurrected and then discovered to be a living fossil. Both of these studies were led by Israeli researchers from other institutions.…. ...
Cycads General characteristics Life cycle Evolution Resources Source for information on Cycads: The Gale Encyclopedia of Science dictionary.
Copyright 2017. The World List of Cycads, online edition. Citation (CSE Style): Calonje M, Stevenson DW, Stanberg L. The World List of Cycads, online edition [Internet]. 2013-2017. [cited 2017 Dec 14]. Available from: http://www.cycadlist.org. ...
Copyright 2020. The World List of Cycads, online edition. Citation (CSE Style): Calonje M, Stevenson DW, Osborne R. The World List of Cycads, online edition [Internet]. 2013-2020. [cited 2020 Jan 28]. Available from: http://www.cycadlist.org. ...
There are only two living species of Lepidozamia. Both of them are restricted to Australia. Lepidozamia hopei is a forest dweller from the Wet Tropics of Queensland. Growing to a height of 20m, it is probably the tallest cycad in the world. Its not so lanky relative L. peroffskyana is found in rainforest and wet sclerophyll from south-eastern Queensland to north-eastern New South Wales ...
File:Macrozamia_stenomera.jpg,right,frame,Figure 1. M. stenomera in habitat.]] ===Introduction: === Macrozamia stenomera is a small (Section Parazamia) cycad that is endemic to New South Wales. It has a subterranean caudex and unique multi-divided pinnae. ===History: === This species was described in 1959 by (the late) Dr L. A. S. Johnson, when he undertook a reclassification of the nomenclature of Australian cycads. Dr Johnson (a former Director of the Royal Botanic Gardens Sydney) found that M. stenomera, which had not been previously distinguished from M. heteromera, warranted recognition as a separate and distinct species. It was named after its narrow divided leaflets. ===Distribution Range: === M. stenomera grows in north-western New South Wales in an area centred principally around Mt Kaputar, which is the highest point of the Nandewar Range. Mt Kaputar is located approximately 50 km east of Narrabri. M. stenomera also grows in sandy soil on the plains nearer ...
Living Fossils- Evolution: The Grand Experiment Episode 2. This astounding documentary shows that many modern animals and plants occur as fossils in rock layers that are dinosaur era. So why do museums refuse to portray dinosaurs with modern organisms? Because this would prove that microbes-to-man evolution never happened!. Interest level: High School-Adult. DVD, 53 Minutes ...
Living fossils not so fossilized; Canadian govt threatens scientists freedom to speak and publish; gene therapy for sensory disorders; an unusual theory of cancer; clues for an HIV vaccine
HLA-DQB2 antibody (major histocompatibility complex, class II, DQ beta 2) for IHC-P, WB. Anti-HLA-DQB2 pAb (GTX104461) is tested in Human samples. 100% Ab-Assurance.
The tRNALeu (UAA) intron has been recorded in the plastid genome of many algae and land plants and was the first intron to be discovered in cyanobacteria. In all known cases it interrupts the tRNALeu anticodon loop at a conserved position (U-intron-AA). Cyanobacteria are a diverse group of photosynthetic prokaryotes, some involved in symbiotic associations with a wide range of organisms. The most studied associations are those with plants, where strains of Nostoc are the common cyanobacterial partner. In this thesis two aspects of the biology of the cyanobacterial tRNALeu (UAA) intron are focused: first, the use of the intron as a genetic marker for studying the diversity and specificity of two cyanobacterial symbiosis (bryophytes and cycads) and second, the evolutionary patterns of the intron by using the unique data set generated from the diversity analysis.. From the studies, many different Nostoc strains are involved in the two symbiotic associations, although no variation was observed ...
We were so excitedly lucky to see a stand of native Indian cycads - Cycas circinalis - in the Anamalais Hills recently (top).My second year at college and I was in a quandary. The unlikely result was a course in plant morphology! I thought I knew a lot about plants and thought them much less…
Specific Microbial Communities Associate with the Rhizosphere of Welwitschia mirabilis, a Living Fossil. . Biblioteca virtual para leer y descargar libros, documentos, trabajos y tesis universitarias en PDF. Material universiario, documentación y tareas realizadas por universitarios en nuestra biblioteca. Para descargar gratis y para leer online.
Welcome to the famous Daves Garden website. Join our friendly community that shares tips and ideas for gardens, along with seeds and plants.
The horseshoe crab is just one example of numerous living fossils or animals that have not changed for aeons of time. The most famous living fossil is the Coelacanth (Latimeria chalumnae) that was thought to be a link between fish and amphibians. Unlike ordinary fish, the Coelacanth gives birth to live offspring. Yet, the Coelacanth, dubbed the dino fish, is clearly a fish and not a half mammal. Evolutionists believed it used its fins to walk on the seabed but observations have shown this to be false. Scientists suspected that it became extinct some 65 million years ago, but in 1938 a living specimen was caught off the coast of Madagascar and since then several others have also been sighted living ...
Words Rhymes & Rhythm Ltd. (RC 1234112), publishing and educational institution that supports and promotes Nigerian writers and writings talents through several initiatives like contests, prizes, and an annual literary festival. Our publishing susbsidiary is AUTHORPEDIA.. ...
Sago palms and other toxic cycads are exceedingly poisonous to dogs and cats. If ingested, immediate veterinary medical attention is required.
There was an advert for Plasmid Tracker on this newsgroup recently. Has anyone used this program? Is useful, stable etc? Im interested in the Windows version for keeping tracks of constructs that are made in my lab. Thanks for your help Andy ------------------------------------------------------------------------ Email : andy.phillips at bbsrc.ac.uk : University of Bristol Home : andy at cycad.demon.co.uk : IACR Long Ashton Research Station Phone : +44-1275-549257 : Long Ashton Fax : +44-1275-394281 : Bristol, BS18 9AF, UK WWW : http://www.lars.bbsrc.ac.uk/plantsci/molbiol/andy.html ...
Living fossils not so fossilized; Canadian govt threatens scientists freedom to speak and publish; gene therapy for sensory disorders; an unusual theory of cancer; clues for an HIV vaccine. 0 Comments. ...
The next day we did more of the same, with a better mount, and more walk trot circles and serpentines. Third day, however, Kate got very fussy with her mouth, tossing her head and jawing a lot, even balking a little. After only ten minutes I climbed off, and, on checking her mouth, found that her lower jaw had hard swellings just below her first molars. Upon checking with the vet it was determined that the lumps were actually her adult molars coming in, but that the baby teeth--caps--above them had not yet been knocked off to make way for them to grow up, so they were pushing down into the jaw. He felt they werent far enough along for him to knock out yet, so I decided she could go back into the pasture until next spring--she was only two, after all! And shes had all the start I could want for a baby. The only thing more I might have done this first summer would have been some easy trail rides around the neighbors cattle pasture.. ...
The reproductive organs of some plants self-heat, release scent, and attract pollinators. The relations among these processes are not well understood, especially in the more ancient, nonflowering gymnosperm lineages. We describe the influence of plant volatiles in an obligate pollination mutualism between an Australian Macrozamia cycad (a gymnosperm with male and female individuals) and its specialist thrips pollinator, Cycadothrips chadwicki. Pollen-laden thrips leave male cycad cones en masse during the daily thermogenic phase, when cone temperatures and volatile emissions increase dramatically and thrips are repelled. As thermogenesis declines, total volatile emissions diminish and cones attract thrips, resulting in pollination of female cones. Behavioral and electrophysiological tests on thrips reveal that variations in b-myrcene and ocimene emissions by male and female cones are sufficient to explain the observed sequential thrips repellence (push) and attraction (pull). These dynamic ...
Cycads comprise one of the groups of these ancient plants. University of Guam horticulturists Thomas Marler and Nirmala Dongol recently studied the seed storage tissue for Guams native cycad species Cycas micronesica. The experimental results appeared in the September 2016 issue of the journal HortScience.. We knew that these seeds contained copious starch, said Marler. At times throughout recorded history the seeds from this abundant tree were exploited as the primary source of starch for human consumption. However, exactly how much starch and how that starch content related to other components of the carbohydrate profile were not known until now.. The experimental results indicated the patterns for sugar changes were opposite of the pattern for starch changes as the seeds aged. The simple sugars fructose and glucose were at their highest concentrations in young seeds, and declined to stabilize after about one year of seed growth. Concentration of the disaccharide sucrose always exceeded ...
plant reproductive system - Gymnosperms: The cycads are slow-growing dioecious (species with individuals that are either male or female) gymnosperms, the microsporangia (potential pollen) and megasporangia (potential ovules) occurring on different individual sporophytes. In all cycads except the genus Cycas, the ovules are borne on...
Reading many textbooks, mainstream articles, we are presented reports of absurdly long ages, ancient, primitive animals and plants depicted as the predecessors of the present, modern ones... Dinosaurs, trilobites and numberless others extinct species are alleged to have lived in Earth dozens of millions years ago. But, how can they be so sure of these…
Gar. These freshwater fish favor warm water; theyre generally found in the southern U.S., Central America, Mexico and the West Indies. Like bowfins, the long-jawed gars are vicious and will eat other fish. Theyre also apt to simply attack any fish in their way, even if they dont intend to eat them. Fun facts: Dont eat gar eggs - they can kill humans and other warm-blooded vertebrates. Gars themselves are also inedible. ...
Ginkgo biloba - This is a living fossil, a tree thought to be long extinct, but now known to survive in the wild in a very small region of China. The tree is upright, columnar and has flat, fan-shaped mid-to yellow-green leaves which turn golden in the fall. Height to 100 feet; spread 25 feet.
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Cycasin is a carcinogenic and neurotoxic glucoside found in cycads such as Cycas revoluta and Zamia pumila. Symptoms of poisoning include vomiting, diarrhea, weakness, seizures, and hepatoxicity. In metabolic conditions, cycasin is hydrolyzed into glucose and methylazoxymethanol (MAM), the latter of which dissociates into formaldehyde and methyl-diazonium. It induces hepatotoxicity and Zamia staggers, a fatal nervous disease affecting cattle resulting from browsing on the leaves or fruit of cycads. Cycasin is found in all known cycad genera and is distributed throughout the body of the plant, but with the highest concentration in the seeds. It is one of several toxins found in cycad plants, along with the neurotoxic amino acid BMAA. The origin and biological role of these toxins is unknown, as there does not appear to be a statistically significant correlation between the concentration of toxic material and the types of herbivory observed in animals consuming the plants. The enzyme ...
Emerging data from the coelacanth genome are beginning to shed light on the origin and evolution of tetrapod genes and noncoding elements. Of particular relevance is the realization that coelacanth retains active copies of transposable elements that once served as raw material for the evolution of new functional sequences in the vertebrate lineage. Recognizing the evolutionary significance of coelacanth genome in this regard, we employed an ab initio search strategy to further classify its repetitive complement. This analysis uncovered a class of interspersed elements (Latimeria Harbinger 1-LatiHarb1) that is a major contributor to coelacanth genome structure and gene content (∼1% to 4% or the genome). Sequence analyses indicate that 1) each ∼8.7 kb LatiHarb1 element contains two coding regions, a transposase gene and a gene whose function is as yet unknown (MYB-like) and 2) copies of LatiHarb1 retain biological activity in the coelacanth genome. Functional analyses verify ...
Joggins was a nice Mississipian site in Nova Scotia wed visited a few years ago. Great site. Cycads falling out of the cliff. If you found it on the beach and could carry it you could keep it. Wed walked down to the beach and turned left, wandered all over the beach and had a great time. Then went back to the hotel. Later in the trip, down in Parrsboro, we talked to someone more familiar than we were with the site and found out that the best fossils were on the right side of the beach. Including a famous Cycad fossil perhaps twenty feet tall ...
The concept of the pteridosperms goes back to the late 19th century when palaeobotanists came to realise that many Carboniferous fossils resembling fern fronds had anatomical features like cycads. British palaeobotanists made the critical discovery that some of these fronds were associated with seeds, and concluded that the fronds and seeds belonged to the same plants.[3] Initially it was still thought that they were intermediate between the ferns and cycads, and especially in the English-speaking world they were referred to as seed ferns or pteridosperms. Today, most palaeobotanists regard them as being only distantly related to ferns and that these names are misleading, but the names have nevertheless stuck. Later during the 20th century, the concept of pteridosperms was expanded to include various Mesozoic groups of seed plants with fern-like fronds. Some palaeobotanists also included seed plant groups with entire leaves such as Glossopteris and its relatives, which was clearly stretching ...
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Ginkgo Biloba Reported Uses - Discover The Secrets Of This Living Fossil, Its Many Benefits And Why It Is Known As The Symbol Of Longevity
Seed-bearing plants were traditionally divided into angiosperms, or flowering plants, and gymnosperms, which includes the gnetophytes, cycads, ginkgo, and
On Fri, 07 Sep 2001 12:28:15 GMT, Penny Morgan ,PMORGAN2 at nc.rr.com, wrote: , Some palms, like Sago, oops....thats a cycad NOT a palm! The task of spiritual science is to observe the macrocosm, the broadest dimensions of the workings of nature, and to understand these workings. Rudolf Steiner ...
This is a unique species native to the West Coast of Africa along a narrow strip from southern Angola through the northern half of Namibia. It is sometimes referred to as a living fossil, because it has changed very little over eons. It is the only species in its Genus, which is the only Genus in the family Welwitschiaceae, which is the only family in the Order Welwitschiales. It was discovered by the Western world by Friedrich Welwitsch in 1859. It has twocotlydeons (first leaves on seed-bearing plants), and then followed in growth by only two more permanent leaves, perpendicular to the cotlyedons. Those two leaves are what is visible on the surface, and they never stop growing while the plant lives. They simply grow longer and longer, with them slowly getting wider as the plant ages. ...
Vampire squid, which sport a Count Dracula cloak-like dark web, turn out to be living fossils that feast on poo and other marine waste enveloped in globs of mucus.
Part 7. Cycadophyta. Proc. Linn. Soc. NSW. 129, 113-149. 2008 - (with Anderson, H.M. and Fitness, L.A.) Stems with attached ...
Pteridospermophyta und Cycadophyta. I. Cycadales. Palaeontographica Abt. B, 248: 1-85. Popa, M.E., 2000. Aspects of Romanian ...
These plants are currently distributed in various botanical institutions around the world.[2] Two of the larger trunks that Wylie collected in the 1907 expedition are still to be seen in the Durban Botanic Gardens.[9] A sucker from one of the Durban Botanic Gardens plants was sent to Kirstenbosch near Cape Town, South Africa in 1916 by James Wylie.[9] The plant that was sent to Kew Gardens in 1899 was grown in the Palm House until April 1997 and then moved to the Temperate House where it produced, for the first time, a male cone in September 2004.[12] In the United States; a specimen is housed in the conservatory at Longwood Gardens near Philadelphia, Pennsylvania[13] and three specimens are to be seen at Lotusland in Santa Barbara, California[14] where they were planted in 1979.[15] The specimen at Longwood Gardens was received in 1969 after a request was made to the Durban Botanic Gardens by one of Longwood's former directors, Dr. Russell Seibert, when he went on a plant exploration voyage to ...
Cycadophyta Cycadatae Conifers Pinophyta Coniferophytatae Ginkgo Ginkgophyta Ginkgoatae Gnetophytes Gnetophyta Anthophytatae ...
They probably fed on plants like Cordaitales or Cycadophyta. With their soft bodies, aphids do not fossilize well, and the ...
Classification of the Cycadophyta to the rank of family. Class Cycadopsida Order Cycadales Suborder Cycadineae Family ...
... fossil Cycadophyta: Bennettitales) against Otopteris. Taxon, 68(4), 874-875. SALFELD, Palaeontographica, 54(4): 186-188, Taf. ...
... fossil Cycadophyta: Bennettitales) against Otopteris. Taxon, 68(4), 874-875.. ...
In gymnosperms like Ginkgo biloba and cycadophyta, a haustorial pollen tube forms. The tube simply soaks up nutrients from the ...
The gymnosperms are a group of seed plants which includes conifers, cycads, Ginkgo and Gnetales.[1] They have naked seeds, in contrast to the seeds or ovules of flowering plants (angiosperms) which are enclosed during pollination. Gymnosperm seeds develop either on the surface of scale- or leaf-like appendages of cones, or at the end of short stalks (Ginkgo). The gymnosperms and angiosperms together make up the spermatophytes or seed plants. By far the largest group of living gymnosperms are the conifers (pines, cypresses, and relatives), followed by cycads, Gnetales (Gnetum, Ephedra and Welwitschia), and Ginkgo (a single living species). Fossil gymnosperms include many that do not belong to the four modern groups, including the so-called "seed ferns" (Pteridosperms) and the "cycadeoids" (Bennettitales). Most of the Gymnosperms became extinct in the Cenozoic era (from 65 million years ago to present day).[2] ...
Cycadophyta have 3 celled pollen grains while Ginkgophyta have 4 celled pollen grains. Gnetophyta may have 2 or 3 celled pollen ... In Cycadophyta, Ginkgophyta, Coniferophyta, and some Gnetophyta, the single celled female gametophyte undergoes many cycles of ... in Cycadophyta and Ginkgophyta, the germ cell is mobile due to flagella being present and a direct tube cell path from the ...
Cycadophyta: the cycads. *Ginkgophyta: the ginkgos. *Gnetophyta: sister group to the Angiosperms ...
Pteropsida Allantodiopsis erosa Cyathea pinnata Onoclea hebridica Osmunda hollicki Saccoloma gardneri Cycadophyta Nageiopsis sp ...
Cycadophyta are typically dioecious (seed strobili and pollen strobili are produced on separate plants). The lateral organs of ...
This listing contains taxa of plants in the division Cycadophyta, recorded from South Africa. Cycads /ˈsaɪkædz/ are seed plants ... Cycadophyta (cycads (42)), Lycopodiophyta (Lycophytes(45)), Marchantiophyta (liverworts (376)), Pinophyta (conifers (33)), and ...
Cycadophyta. palmlehiktaimed. 160 [11]. Ginkgophyta. hõlmikpuutaimed. 1 [12]. Pinophyta. okaspuutaimed. 630 [10]. ...
Cycadophyta (cycads, 10, 300). *Ginkgophyta (gingko, 1, 1). *Gnetophyta (3, 100). in which the Pinophyta include all conifers, ...
... is a family within the Bennettitales, an extinct group of seed plants within the Cycadophyta subdivision. ...
True gymnosperms like Gingko (Ginkophyta) and Cycads (Cycadophyta) would appear slightly after the Devonian in the ...
Cycadophyta - sagovci. Gnetophyta - Gnetum, Ephedra, Welwitschia. Golosemenke (znanstveno ime Gymnospermae) so ena izmed skupin ...
Cycadophyta Cycadatae Konifere Pinophyta Coniferophytatae Ginkgo Ginkgophyta Ginkgoatae Gnetophytes Gnetophyta Anthophytatae ...
Cycadophyta, cikade. *Ginkgophyta, ginko. *Pinophyta, četinari. *Gnetophyta, gnetofite. *Magnoliophyta, cvjetnice[12][13] ...
Cycadophyta, Gnetophyta, and Ginkgophyta: characteristics of early seed plants". Canadian Journal of Botany. 80 (9): 954-961. ...
Cycadophyta, Gnetophyta, and Ginkgophyta: characteristics of early seed plants". Canadian Journal of Botany. 80 (9): 954-961. ... Seed producing vascular plants of the division Cycadophyta recorded from South Africa Lists of flowering plants of South Africa ... Cycadophyta (cycads (42)), Lycopodiophyta (Lycophytes(45)), Marchantiophyta (liverworts (376)), Pinophyta (conifers (32)), and ...
Cycadophyta, Gnetophyta, and Ginkgophyta: characteristics of early seed plants". Canadian Journal of Botany. 80 (9): 954-961. ...
The Embryophyta or Metaphyta, are the maist familiar subkingdom o green plants that furm vegetation on yird. The embryophytes include hornworts, liverworts, mosses, ferns an thair allies, gymnosperms an flouerin plants, but exclude the green algae. The Embryophyta are informally cried land plants acause thay live primarily in terrestrial habitats, while the relatit green algae are primarily aquatic. Aw are complex multicellular eukaryotes wi specialised reproductive organs. The name derives frae thair innovative characteristic o nurturin the young embryo sporophyte durin the early stages o its multicellular development within the tissues o the parent gametophyte. Wi very few exceptions, embryophytes obtain thair energy bi photosynthesis, that is bi uisin the energy o sunlicht tae synthesize thair fuid frae carbon dioxide an watter. ...
സസ്യസാമ്രാജ്യത്തിൽ (കിങ്ഡം : പ്ലാന്റേ) ഉൾപ്പെടുന്ന ബഹുകോശ യൂക്കാരിയോട്ടുകളാണ് സസ്യങ്ങൾ, ഹരിതസസ്യങ്ങൾ എന്നും അറിയപ്പെടുന്നു. വൃക്ഷങ്ങൾ, ഓഷധികൾ, കുറ്റിച്ചെടികൾ, തൃണങ്ങൾ, വള്ളികൾ, പന്നലുകൾ, പായലുകൾ, ഹരിതനിറമുള്ള ആൽഗകൾ തുടങ്ങിയവ സസ്യസാമ്രാജ്യത്തിൽ ഉൾപ്പെടുന്നു. ബീജസസ്യങ്ങൾ, ബ്രയോഫൈറ്റുകൾ, പന്നൽച്ചെടികൾ, അനുഫേണുകൾ എന്നിങ്ങനെ നിർവചിക്കപ്പെട്ടിരിക്കുന്ന ഏകദേശം 350,000 ...
Alternative names and the approximate number of genera and species in each are; Cycadidae (Cycadophyta, cycads 10, 300) ... division Cycadophyta class Cycadae Benson,(1957) who introduced the term Pinales, divided gymnosperms into four classes; ...
Sperm cells of Pinophyta and Gnetophyta are without flagella, and are carried by the pollen tube, while those of Cycadophyta ...
Cycadophyta (*cycads*)* A division of gymnosperms [1] comprising plants with leaves and habit similar to those of palm trees, ... Cycadophyta (cycads) A division of gymnosperms comprising plants with leaves and habit similar to those of palm trees, although ... Cycadophyta A phylum of seed plants (see gymnosperm) that contains many extinct species; the few modern representatives of the ... Cycadophyta A Dictionary of Plant Sciences © A Dictionary of Plant Sciences 1998, originally published by Oxford University ...
Cycadophyta Bessey 1907: 321. References[编辑]. *Bessey, C.E. (1907) "A synopsis of plant phyla". Nebraska University Studies 7: ... NCBI link: Cycadophyta. Vernacular names[编辑]. Boarisch: Poimfarn. Deutsch: Palmfarne. English: cycad. español: Cicadáceas. ... Divisio: Cycadophyta Classis: Cycadopsida Name[编辑]. ... 取自"https://species.wikimedia.org/w/index.php?title=Cycadophyta& ...
Cycadophyta. Cycads resemble palm trees with fleshy stems and leathery featherlike leaves. The 10-11 genera and 305 living ...
Cycadophyta Ginkgophyta Gnetophyta Extant members 50-60 genera, about 550 species. 11 genera, about 160 species. 1 species ( ... The Cycadophyta, or cycads, are restricted to tropical latitudes and were more abundant in the geologic past. These plants have ... There are four groups of gymnosperms living today-Coniferophyta, Cycadophyta, Ginkgophyta, and Gnetophyta-but many additional ... Cycadophyta (cycads), Ginkgophyta (ginkgo), and Gnetophyta (e.g. Welwitschia). See also progymnosperms.. ...
Cycads (Cycadophyta). *Cycadaceae family *Ngathu cycad, Cycas angulata. *Zamiaceae family *Wunu cycad, Lepidozamia hopei ...
Division Cycadophyta (the cycads). Flowering Plants (the Angiosperms). Flowering plants are assembled in beds and displays.In ...
These plants are currently distributed in various botanical institutions around the world.[2] Two of the larger trunks that Wylie collected in the 1907 expedition are still to be seen in the Durban Botanic Gardens.[9] A sucker from one of the Durban Botanic Gardens plants was sent to Kirstenbosch near Cape Town, South Africa in 1916 by James Wylie.[9] The plant that was sent to Kew Gardens in 1899 was grown in the Palm House until April 1997 and then moved to the Temperate House where it produced, for the first time, a male cone in September 2004.[12] In the United States; a specimen is housed in the conservatory at Longwood Gardens near Philadelphia, Pennsylvania[13] and three specimens are to be seen at Lotusland in Santa Barbara, California[14] where they were planted in 1979.[15] The specimen at Longwood Gardens was received in 1969 after a request was made to the Durban Botanic Gardens by one of Longwoods former directors, Dr. Russell Seibert, when he went on a plant exploration voyage to ...
Cycadophyta Cycadatae Conifers Pinophyta Coniferophytatae Ginkgo Ginkgophyta Ginkgoatae Gnetophytes Gnetophyta Anthophytatae ...
Domain: Eukaryota • Regnum: Plantae • Divisio: Cycadophyta • Classis: Cycadopsida • Ordo: Cycadales • Familia: Zamiaceae • ...
Phylum Cycadophyta. The cycads look like palms with cones and are prevalent worldwide in the tropics and subtropics (two ...
gymnosperm: Cycadophyta. Cycads resemble palm trees with fleshy stems and leathery featherlike leaves. The 10-11 genera and 305 ... Division Cycadophyta. Gymnospermous plants possessing compound leaves; ovules have 1 integument; seeds borne on either the ... Division Cycadophyta Permian to the present; palmlike plants; leaves usually pinnately compound; dioecious; seeds borne in ... Cycadophyta (cycads) Palmlike gymnospermous plants with typically short, thick, unbranched aerial trunks, sometimes ...
Cycadophyta (cycads) Pinophyta (conifers) Ginkgophyta (ginkgo) Gnetophyta Magnoliophyta (flowering plants) Progymnospermophyta ...
The gymnosperms are a group of seed plants which includes conifers, cycads, Ginkgo and Gnetales.[1] They have naked seeds, in contrast to the seeds or ovules of flowering plants (angiosperms) which are enclosed during pollination. Gymnosperm seeds develop either on the surface of scale- or leaf-like appendages of cones, or at the end of short stalks (Ginkgo). The gymnosperms and angiosperms together make up the spermatophytes or seed plants. By far the largest group of living gymnosperms are the conifers (pines, cypresses, and relatives), followed by cycads, Gnetales (Gnetum, Ephedra and Welwitschia), and Ginkgo (a single living species). Fossil gymnosperms include many that do not belong to the four modern groups, including the so-called "seed ferns" (Pteridosperms) and the "cycadeoids" (Bennettitales). Most of the Gymnosperms became extinct in the Cenozoic era (from 65 million years ago to present day).[2] ...
This is a main category requiring frequent diffusion and maybe maintenance. As many pictures and media files as possible should be moved into appropriate subcategories ...
Cycadophyta: the cycads. *Ginkgophyta: the ginkgos. *Gnetophyta: sister group to the Angiosperms ...
Divisio: Cycadophyta Classis: Cycadopsida Ordo: Cycadales Subordo: Zamiineae Familia: Zamiaceae Subfamilia: Encephalartoideae ...
Cycadophyta : - Cycadophyta: There are approximately 350 species of plants in this division which, by the shape of their trunks ...
Classification of the Cycadophyta to the rank of family. Class Cycadopsida Order Cycadales Suborder Cycadineae Family ...
Cycadophyta. palmlehiktaimed. 160 [11]. Ginkgophyta. hõlmikpuutaimed. 1 [12]. Pinophyta. okaspuutaimed. 630 [10]. ...
Cycadophyta (cycads, 10, 300). *Ginkgophyta (gingko, 1, 1). *Gnetophyta (3, 100). in which the Pinophyta include all conifers, ...
In gymnosperms like Ginkgo biloba and cycadophyta, a haustorial pollen tube forms. The tube simply soaks up nutrients from the ...
Cycadophyta - sagovci. Gnetophyta - Gnetum, Ephedra, Welwitschia. Golosemenke (znanstveno ime Gymnospermae) so ena izmed skupin ...
Divisiones (Phyla): Angiospermae - Anthocerotophyta - Bryophyta - Charophyta - Chlorophyta - Cycadophyta - Ginkgophyta - ...
The most abundant compound in all plants, as in all life, is water which serves an important role in the various processes taking place. Transpiration is the main process a plant can call upon to move compounds within its tissues. The basic minerals and nutrients a plant is composed of remain, generally, within the plant. Water is constantly lost from the plant through its stomata to the atmosphere.. Water is transpired from the plants leaves via stomata, carried there via leaf veins and vascular bundles within the plants cambium layer. The movement of water out of the leaf stomata creates, when the leaves are considered collectively, a transpiration pull. The pull is created through water surface tension within the plant cells. The draw of water upwards is assisted by the movement of water into the roots via osmosis. This process also assists the plant in absorbing nutrients from the soil as soluble salts, a process known as absorption. Surprisingly, the movement of water upwards requires very ...
Division Bryophyta ? Psilophyta (Psilotum)? Lycophyta (Club Mosses)? Sphenophyta (Horsetails)? Pterophyta (Ferns)? Cycadophyta ... Cycadophyta (Cycads)? Ginkgophyta (Maidenhair Tree)? Anthophyta (Flowering Plants)? Coniferophyta (Cone-Bearing Trees & Shrubs ...
Cycadophyta a Pinophyta (Gingkoopsida); 7. Gymnosperms 2: Pinophyta (Pinopsida), Gnetophyta; 8-14. Selected important families ...
Cycadophyta Cycadatae Konifere Pinophyta Coniferophytatae Ginkgo Ginkgophyta Ginkgoatae Gnetophytes Gnetophyta Anthophytatae ...
while those of Cycadophyta and Ginkgophyta have many flagella. with a large number of male plants nearby. for dispersal by ...
The Species 2000/ITIS Catalogue of Life : 2006 Annual Checklist is a comprehensive index of all known plants, animals, fungi and micro-organisms. It can be used to search multiple databases simultaneously for the scientific name of an organism.
  • We first downloaded from GenBank all core nucleotide sequence data from gymnosperms (Coniferophyta, Cycadophyta, Ginkgophyta, and Gnetophyta). (hindawi.com)
  • Ginkgophyta (the ginkgo tree), Cycadophyta (the cycads)), and Gnetophyta (the genera Gnetum , Ephedra , and Welwitschia ). (newworldencyclopedia.org)
  • Cycadophyta ( cycads ) A division of gymnosperms comprising plants with leaves and habit similar to those of palm trees, although some species are quite small. (encyclopedia.com)
  • the palm-like Cycads (Cycadophyta) , and herb-like plants that bear cones (Gnetophyta) such as Mormon tea. (infoplease.com)
  • Cycads belong to the biological division Cycadophyta. (wikia.com)
  • Divisions Green algae land plants (embryophytes) non-vascular embryophytes Hepatophyta - liverworts Anthocerophyta - hornworts Bryophyta - mosses vascular plants (tracheophytes) seedless vascular plants Lycopodiophyta - clubmosses Equisetophyta - horsetails Pteridophyta - true ferns Psilotophyta - whisk ferns Ophioglossophyta - adderstongue ferns seed plants (spermatophytes) †Pteridospermatophyta - seed ferns Pinophyta - conifers Cycadophyta - cycads Ginkgophyta - ginkgo Gnetophyta - gnetae Magnoliophyta - flowering. (statemaster.com)
  • En algunes classificacions, el grup s'ha considerat un regne , [10] sota diversos noms com Viridiplantae, Chlorobionta, o simplement Plantae , aquest darrer expandint el tradicional regne vegetal per incloure les algues verdes. (wikipedia.org)
  • Drawing the tree of eukaryotic life based on the analysis of 2,269 manually annotated myosins from 328 species » (en anglès). (wikipedia.org)
  • To further reveal the conservation of TAS3-like loci in lower seed plants, we performed PCR amplification of total DNA from Cycadophyta (Cycas revoluta, Strangeria eriupus, Zamia pumila, and Macrozamia miqnolii) using dicot-specific primers P-Tas3, M-Tas3/caa, and M-Tas3/aca [23]. (thefreedictionary.com)