Pileus (Cap): (1)1.5- 3.5(4) cm, Campanulate then convex to plane, obtuse, dingy gray to blackish, often with reddish or hazel tones, hygrophanous, pallid grey to yellowish when dry, smooth, with a narrow brown marginal band, slightly striate at the margin when moist. Flesh thin and grayish.
Lamellae (Gills): Adnate, close to crowded, at first gray-olivacous, becoming mottled and darkening to black with age, edges remaining whitish.
Stipe (Stem): (4)6 - 8(10) cm x 1 - 2(3) mm, equal, slender, slightly enlarging at the base, hollow, fragile, dingy white to clay, becoming brownish towards the base in age, smooth, white-pruinose at the apex, obsoletely slightly silky-striate, ring absent. Flesh is dirty ochraceous-buff; fragile.
Microscopic features: Spores Blackish gray. 10.8 - 14.2 X 6.9-9.5, elipsiod or lemon shaped, basidia 4 spored. Gill edge cystidia fusiform, typically with long necks, gill face cystidia absent.
Season: In the spring or during the rainy seasons.
Habitat and Distribution: Panaeolus fimicola can be found growing in soil or dung, fertilized lawns and other grassy places, late spring to mid-fall. Widespread across the Americas, as well as Europe and Africa; common. BumbleBeeMO Occurrence Map
Growth Habit: Solitary to scattered.
Bruising: Slight bruising at some of the specimens at the base.
Dosage: Weakly active.
Other Notes: It is hard to imagine a duller mushroom, but this very dark mottlegill somehow manages to make itself conspicuous on lawns after rain. The dark-brown caps %u2013 sometimes almost black %u2013 fade with age, covering a huge range of shades of brown. You may find it listed in some field guides as Panaeolus ater. This is a toxic toadstool. (There can be small amounts of the hallucinogen psilocybin in these fungi.