Coprinopsis stercorea

Appearance

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.

Stipe
Stipe 1.0-3.5 cm long, 0.5-1.0 mm thick, more or less equal, hollow, fragile; surface watery-white to pale-grey, when young covered with whitish hairs, soon sparse, except at the base; partial veil absent.

Spores
Spores 6.5-8.0 x 3.0-3.5 µm, smooth, moderately thick-walled, cylindrical-elliptical in face-view, similar in profile but slightly inequilateral, hilar appendage inconspicuous, germ pore central; medium-brown mounted in KOH; spores blackish in deposit.

Naming

Coprinus stercoreus

Habitat

Scattered to clustered on herbivore dung, especially that of horses and cows; fruiting throughout the mushroom season; common.