This is a very common lawn species with a dark brown to purplish-brown spore print and distinctly warty spores, which separate it from the smooth-spored Panaeolus. It is inedible and often confused with psychoactive species, though it contains no hallucinogens.

Cap: 10-35 mm, conical to bell-shaped to convex. Hygrophanous: dark brown when moist, drying to pale tan or buff, often in bands. Bald, sometimes splitting radially with age; margin becomes finely lined.
Gills: Narrowly attached, close, with frequent short gills. Greyish-brown to dark brown, sometimes mottled; edges often paler.
Stipe: 60-100 mm x 15-30 mm, slender, fragile, hollow. Whitish when young, becoming brownish below, sometimes with fine whitish fibrils. No ring.