Betula pendula: Betula pendula, commonly known as silver birch or warty birch, is a species of tree in the family Betulaceae, native to Europe and parts of Asia, though in southern Europe it is only found at higher altitudes. Its range extends into Siberia, China and southwest Asia in the mountains of northern Turkey, the Caucasus and northern Iran.Alnus sieboldiana: Alnus sieboldiana (オオバヤシャブシ in Japanese) is an alder species found on the islands of Honshū, Shikoku, and Suwanose-jima in Japan.Kew World Checklist of Selected Plant FamiliesAlnusiinPhyllactinia guttata: Phyllactinia guttata is a species of fungus in the Erysiphaceae family; the anamorph of this species is Ovulariopsis moricola. A plant pathogen distributed in temperate regions, P.Larix kaempferi: Larix kaempferi, known as Japanese larch or karamatsu (唐松) in Japanese) is a species of larch native to Japan, in the mountains of Chūbu and Kantō regions in central Honshū.Farjon, A.List of Copper Country minesPeat swamp forest: Peat swamp forests are tropical moist forests where waterlogged soil prevents dead leaves and wood from fully decomposing. Over time, this creates a thick layer of acidic peat.PollenFraxinus latifolia: Fraxinus latifolia (Oregon ash) is a member of the ash genus Fraxinus, native to western North America. The Oregon ash is dioecious.Salix Pharmaceuticals: Salix Pharmaceuticals, Inc. is a specialist American pharmaceutical company.Allergen immunotherapy: Allergen immunotherapy, also known as desensitization or hypo-sensitization, is a medical treatment for some types of allergies. It is useful for environmental allergies, allergies to insect bites, and asthma.