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Mycena atkinsoniana
''Mycena atkinsoniana'' is a species of agaric fungus in the Mycenaceae family. It is one of the so-called "bleeding mycenas" that will ooze yellow to orange juice when injured. Other distinguishing features include the upper stem surface that is decorated with tiny purplish-brown fibers, and the gills, which are pale yellow with maroon edges. The reddish-brown caps are smooth with a grooved margin, and up to wide. ''Mycena atkinsoniana'' is known from the United States and Canada, where it grows scattered or in groups on leaf litter in forests during the summer and autumn. It was originally described from collections associated with beech, but it is also frequently found under eastern North American oaks.
==Taxonomy==
The species was first described in 1935 as ''Mycena fagicola'' by American mycologist Alexander H. Smith, based on specimens that he collected the previous year in Cross Village, Michigan.〔 The naming, however, was illegitimate, as it had been previously used by Camille Grognot (as ''Mycena fagicola'' Grogn. apud Roumeguère published in 1885〔), so Smith changed the specific epithet to ''atkinsoniana'' in his 1947 monograph on North American ''Mycena'' species.〔 Smith credited George Francis Atkinson with one of the early collections of the fungus in his 1935 species description.〔 ''Mycena'' specialist Rudolph Arnold Maas Geesteranus agreed with Smith's decision to change the epithet, concluding that although Grognot's name was a ''nomen nudum'' (written without an adequate description), he conceded that "the possibility cannot be excluded that one day some overlooked 19th century booklet or exsiccatum will turn up containing a description".〔
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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