Gymnopilus validipes is a mushroom in the family Hymenogastraceae. It is widely distributed in North America and Europe.
7.5 — 15 cm, convex to broadly convex, margin deeply incurved at first, becoming revolute with age, dry, fibrillose or with small ochraceous brown scales, pale-yellow or ochraceous buff, flesh soft, whitish, yellowish near the gills.
10 — 13 cm long, 2.5 – 5 cm. thick, equal or swelling in the middle, fleshy-fibrous, solid, elastic, fibrillose, concolorous, white within, the cortina leaves only a faint ring on the stalk. The specific epithet validipes means "having a robust stalk".
Gymnopilus validipes contains the hallucinogens psilocybin and psilocin, the latter at a concentration of around 0.12%.[1]
Gymnopilus validipes is found growing gregarious (in groups) to cespitose (in dense clumps) on tree stumps, hardwood logs and debris, widespread in the United States, common from the Great Lakes and eastward.