Panaeolus bisporus, also known as Copelandia bisporus is a rare and widely distributed little brown mushroom that bruises blue and contains the hallucinogen psilocybin.
Cap: 15-30 mm tan to gray fading to black sometimes when covered with spores and with a defined ring zone somewhat globe shaped or bell shaped to convex, hardly expanding, margin often torn and pedaled, smooth not viscid, and slightly wrinkled and pitted with age. Dark grey-brown drying whitish.
Gills: adnexed or narrowly attachedtightly packed, mottled gray to jet black, white edges
Stem: white, fibrous, 65-120 mm long 2-3 mm thick, hollow, translucent gray, bruising heavily blue where bruised
Spores: jet black, elliptical, 12-14 x 8-10 x 6-7.5 µm smooth and opaque, elongated with germ pore straight off the end
Habitat: saprotrophic on grasses
Microscopic features: 2 spored basidia 18 - 23 × 8-10 µm, cheilocystidia are bottle shaped and clear 20-30 µm, metuloids with yellow brown walls 40-55 × 12-15 µm some with excreted crystals
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