Cortinarius validipes Gymnopolis magna Gymnopilus validipes is a mushroom in the family Hymenogastraceae.

It is widely distributed in North America and Europe.

Gymnopilus validipes contains the hallucinogens psilocybin and psilocin, the former 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.

Media related to Gymnopilus validipes at Wikimedia Commons