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Amanita abrupta : ウィキペディア英語版 | Amanita abrupta
''Amanita abrupta'', commonly known as the American abrupt-bulbed Lepidella, is a species of fungus in the Amanitaceae family of mushrooms. Named for the characteristic shape of its fruit bodies, this white ''Amanita'' has a slender stem, a cap covered with conical white warts, and an "abruptly enlarged" swollen base. This terrestrial species grows in mixed woods in eastern North America and eastern Asia, where it is thought to exist in a mycorrhizal relationship with a variety of both coniferous and deciduous tree species. == Taxonomy == ''Amanita abrupta'' was first described by American mycologist Charles Horton Peck in 1897, based on a specimen he found in Auburn, Alabama. Because the remains of the volva are not present on the bulb in dried, mature, specimens, Peck thought that the species should be grouped with ''Amanita rubescens'' and ''A. spissa''.〔 Synonyms include binomials resulting from generic transfers by Jean-Edouard Gilbert to ''Lepidella'' in 1928, and to ''Aspidella'' in 1940.〔 Both of these genera have since been subsumed into ''Amanita''.〔 ''A. abrupta'' is the type species of the section ''Lepidella'' of the genus ''Amanita'', in the subgenus ''Lepidella'', a grouping of related ''Amanita'' mushrooms characterized by their amyloid spores.〔 Other North American species in this subgenus include ''A. atkinsoniana'', ''A. chlorinosma'', ''A. cokeri'', ''A. daucipes'', ''A. mutabilis'', ''A. onusta'', ''A. pelioma'', ''A. polypyramis'', ''A. ravenelii'', and ''A. rhopalopus''.〔 European and Asian species (also in section ''Lepidella'') that are phylogenetically related—close to it in the evolutionary family tree—include ''A. solitaria'', ''A. virgineoides'', and ''A. japonica''.〔 The specific epithet ''abrupta'' refers to the shape of the swollen base, which is abruptly enlarged rather than gradually tapering.〔Metzler and Metzler (1992), (p. 64 ).〕 The species' common name is the "American abrupt-bulbed Lepidella".〔
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