Psilocybe aztecorum

Psilocybe aztecorum is a species of psilocybin mushroom in the family Hymenogastraceae. Known from central Mexico, Arizona, California, Oregon, Colorado, Canada, Costa Rica, and possibly India, the fungus grows on decomposing woody debris and is found in mountainous areas at elevations of 2,000 to 4,000 m (6,600 to 13,100 ft), typically in meadows or open, grassy conifer forests. The mushrooms have convex to bell-shaped caps 1.5–2 cm (0.6–0.8 in) in diameter, atop slender cylindrical stems that are up to 7.5 cm (3.0 in) long. The color of the caps changes with variations in hydration, ranging from dark chestnut brown to straw yellow or whitish when dry. The base of the stem is densely covered with conspicuous white rhizomorphs, a characteristic uncommon amongst Psilocybe species. The species was first reported by French mycologist Roger Heim in 1956 as a variety of Psilocybe mexicana before he officially described it under its current name a year later. Named for its association with t......read more on Wikipedia.