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Protostropharia semiglobata
''Protostropharia semiglobata'', commonly known as the dung roundhead, the halfglobe mushroom, or the hemispheric stropharia, is an agaric fungus of the family Strophariaceae. A common and widespread species with a cosmopolitan distribution, the fungus produces mushrooms on the dung of various wild and domesticated herbivores. The mushrooms have hemispherical straw yellow to buff-tan caps measuring , greyish gills that become dark brown in age, and a slender, smooth stem long with a fragile ring.
==Taxonomy==
The species was first described as ''Agaricus semiglobatus'' by August Batsch in 1786.〔 It has had a complicated taxonomic history, having been shuffled to many different genera. In addition to ''Agaricus'' the species has been placed in ''Coprinus'', ''Geophila'', ''Psalliota'', and ''Psilocybe''. French mycologist Lucien Quélet gave it its most commonly used name in 1872 when he transferred it to ''Stropharia''.〔 In 2013, Scott Redhead made it the type species of ''Protostropharia'', a new genus circumscribed to contain ''Stropharia'' species characterized by the formation of astrocystidia rather than acanthocytes on their mycelium.〔 A form ''sterilis'' and two varieties, ''minor'' and ''radicata'', described by F.H. Møller in 1945,〔 are no longer considered to have independent taxonomic significance.〔
The specific epithet ''semiglobata'' is Latin for "half-spherical", and refers to the shape of the cap.〔 It is commonly known as the halfglobe mushroom, the hemispheric stropharia,〔 the round stropharia,〔 or the dung roundhead.〔
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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