Panaeolus affinis is a species of psychoactive mushroom belonging to the genus Panaeolus and is classified under the order Agaricales . Before the name of the species was changed in 1996, it was known as Copelandia affinis. The mushroom was first observed in 1980 by E. Horak. The mushroom contains the chemicals psilocybin and psilocin, which cause hallucinations and distorted perception of reality when ingested.

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