Psilocybe merdaria (Fr.) Ricken Stropharia merdaria (Fr.) Quél. syn. Dung-Träuschling. Cap 2–5cm across, obtusely bell-shaped then flattened convex, ochraceous, more cinnamon when moist, viscid. Stem 50–75 x 4–6mm, dry, whitish flushed straw-yellow, base covered in white down. Flesh white, becoming brownish in stem when old. Smell none. Gills pallid then purplish-brown. Cheilocystidia thin-walled, hyaline, lageniform. Spore print brown-black. Spores broadly elliptical and often somewhat angular, with germ-pore, 10–16 x 8–9um. Habitat on horse dung. Season late summer to autumn. Uncommon. Edibility unknown, possibly slightly hallucinogenic although it has not been investigated in detail, all hallucinogenic mushrooms can be dangerous to eat. Distribution, America and Europe.