Gymnopilus luteoviridis

Wood-decaying rust-spored mushroom whose bright golden flesh contains psilocybin alongside an intensely bitter taste — a chemical combination that has prevented it from ever becoming popular for recreational use.

Saprotrophic, fruits in clusters on hardwood logs and stumps in deciduous forests of eastern North America.

• No documented traditional use

One of the relatively few psilocybin-active Gymnopilus species; most members of the genus are non-psychoactive or contain only bis-noryangonin.