Panaeolus bisporus

Panaeolus bisporus two spored basidum

This is a little brown mushroom that grows on dung and has black spores. It has been found in Hawaii, Southern California, North Africa, Spain and Switzerland.

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

• List of Panaeolus species

• Stamets, Paul (1996). Psilocybin Mushrooms of the World. Berkeley: Ten Speed Press. ISBN 0-9610798-0-0.

• Mushroom Observer - Panaeolus bisporus
• Panaeolus bisporus microscopy composite
• Panaeolus bisporus photo