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Amanita nivalis
''Amanita nivalis'', the snow ringless amanita or mountain grisette, is a species of basidomycote fungus in the genus ''Amanita''. It was first described by the Scottish mycologist Robert Kaye Greville in 1826 from specimens found growing at high altitudes in the Scottish Highlands. He gave it the Latin epithet ''nivalis'' (of the snow) to indicate the alpine type habitat in which he found it growing rather than to describe its white colour.〔(【引用サイトリンク】title=''Amanita nivalis'' )〕
== Description ==
''Amanita nivalis'' is a small species of fungus which is usually white when young but which becomes tinged with grey or buff as it ages. It is rather variable in appearance over its wide range. The cap is dry, smooth and shiny and may be any size between . It becomes slightly sticky when wet. It is hemi-spherical when young but flattens out with age and develops a slight umbo. Near the rim there are fine radiating striations and the surface of the cap may have a few pieces of the membranous volva adhering to it. The gills are pale cream, broad, fairly crowded and mostly unconnected to the stem. There are a few irregularly arranged shorter gills with truncated ends. The stem is long and wide, hollow and with a smooth surface. There may be a fragile ring but it soon falls off. The base of the stem grows out of a brittle, sac-like volva which is white or pale yellowish-brown. The spores are nearly spherical, being 10.0 to 13.5 µm by 8.8 to 12.0 µm. This species is said to have a nondescript odour and flavour.〔〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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