Coprinopsis stercorea

Pileus
Cap 4.0-10.0 mm broad at maturity, at first ellipsoid to ovoid, then obtuse-conic, expanding to plane, the margin becoming recurved and torn; surface white to pale-grey, striate-plicate to near the disc, mealy-granulose, hairy toward the margin, in age the hairs inconspicuous; context thin, membranous, weakly deliquescent; odor unpleasant; taste untried.

Lamellae
Gills adnexed, subdistant, narrow, pallid in youth, eventually blackish; lamellulae in up to two series.
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