Gymnopilus braendlei is a species of agaric fungus in the family Hymenogastraceae that contains the hallucinogens psilocybin and psilocin.

[2] It was originally described by mycologist Charles Horton Peck as Flammula braendlei, from specimens found in the District of Columbia in 1902.

Gymnopilus braendlei is found growing solitary or cespitose on tree stumps from June to November.

It is widespread in the eastern U.S, and present in the western U.S.