Psilocybe cubensis (Earle) Singer Cap 1.5-9cm across, broadly conical to bel-shaped, becoming convex and flatter with an umbo, the margin sometimes with hanging veil remnants; white with a yellowish or brownish center, becoming entirely yellowish buff to yellowish brown, bruising and aging bluish; sticky when moist then dry, smooth or some small, whitish veil remnants when young. Gills adnate, close, narrow; gray becoming deep purple-gray to almost black, edges whitish. Stem 40-150 x 4-15mm, often enlarged toward the base; white or yellowish, bruising blue or bluish green; smooth, grooved at the top; membranous partial veil leaves a persistent white ring on the upper stalk which is blackened by the falling spores. Flesh firm; white, bruising bluish green. Spores ellipsoid, smooth, with a distinct pore at the tip, 11-17 x 7-12µ. Deposit purple-brown. Habitat singly or in groups on horse dung or cow manure in cattle pastures. Common. Found in the Gulf Coast states and in central America. Season nearly all year. Edibility suspect - strongly hallucinogenic, possibly poisonous. Photographed by Greg Wright.