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Psathyrella
''Psathyrella'' is a large genus of about 400 fungi, and is similar to the genera ''Coprinellus'', ''Coprinopsis'', ''Coprinus'' and ''Panaeolus'', usually with a thin cap and white or yellowish white hollow stem. The caps do not self digest as do those of ''Coprinellus'' and ''Coprinopsis''. Some also have brown spores rather than black. These fungi are often drab-colored, difficult to identify, and inedible, and so they are sometimes considered uninteresting. However they are quite common and can occur at times when there are few other mushrooms to be seen. The first report of a gilled mushroom fruiting underwater is ''Psathyrella aquatica''.
The genus name Psathyrella is a diminutive form of Psathyra, derived from the Greek word meaning "friable", psathuros (ψαθυρος)
==Characteristics==
In order to identify the species it may be necessary to take into account the presence and nature of any veil remnants on cap (which may only be visible on very young fruiting bodies), the colour of young fruiting bodies, which is often more vivid than with older ones, whether the cap is hygrophanous (it can well be a translucent brown or ochre colour in a humid state but a pure opaque white on drying out), and the spore size and the presence and nature of cheilocystidia, pleurocystidia and caulocystidia, distinctive sterile cells on the gill face, gill edge and stipe respectively.
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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