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Agaricus abruptibulbus
''Agaricus abruptibulbus'' is a species of mushroom in the genus ''Agaricus''. It is commonly known as the abruptly-bulbous agaricus〔 or the flat-bulb mushroom.〔 First described by the mycologist Charles Horton Peck,〔 this bulbous-stemmed edible species smells slightly of anise, and turns yellow when bruised or cut. The mushroom is medium-sized, with a white, yellow-staining cap on a slender stipe that has a wide, flat bulb on the base
==Taxonomy and classification==
The species was originally named as ''Agaricus abruptus'' by American mycologist Charles Horton Peck in 1900.〔 In his 1904 ''Report of the State Botanist'' publication, he changed the name to ''Agaricus abruptibulbus''. He explained that Elias Magnus Fries had earlier named a species in the subgenus ''Flammula'', which he called ''Agaricus abruptus''; the subgenus was later raised to the rank of genus, and the species was given the name ''Flammula abruptus''. Under the transitioning nomenclatural conventions of the time, it was unclear if ''Agaricus abruptus'' would remain available for use, so he changed the name.〔
''Agaricus abruptibulbus'' belongs in the Arvenses clade of the genus ''Agaricus'' (along with species ''A. silvicola'', ''A. arvensis'', and ''A. semotus'').〔
Some American authors consider this species to be synonymous with ''A. silvicola'',〔〔 while some in Europe have synonymized it with the similar species ''A. essettei''. American mycologists Steve Trudell and Joseph Ammirati noted in a 2009 field guide: "The name ''A. abruptibulbus'' has been applied to forms with bulbous stipe bases, but variation in stipe shape is so great that the use of this name has been largely abandoned."〔
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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