Substrate: Horse dung
Spores: April-October
Conservation Status: Not of concern
Cap: 1-3 cm across, convex to slightly umbonate; dull yellow-orange to yellow-brown; smooth, viscid. Gills: distant, broad; pale yellowish then purple-brown. Stem: 20-40 x 1-3 mm, equal; yellow; dry, with veil leaving a ring zone at apex. Flesh pallid becoming brownish in stem. Odor not distinctive. Taste not distinctive. Spores: purple-brown, ellipsoid.
Sources: Phillips, Roger. Mushrooms and Other Fungi of North America. Buffalo, Firefly Books Ltd. 2010.
PNW Herbaria: Specimen records of Psilocybe merdaria in the Consortium of Pacific Northwest Herbaria database
CalPhotos: Psilocybe merdaria photos