Psilocybe

A genus of mushrooms (family Agaricaceae) containing many species with psychotropic or hallucinogenic properties, including P. mexicana, of which the fruiting bodies are a source of the hallucinogen, psilocybin.

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Psi·lo·cy·be (si″lo-siґbe) a genus of mushrooms of the family Strophariaceae, native to the southern United States and Mexico; several species are sources of psilocybin and psilocin and are consumed in some North American Indian cultures as part of religious ceremonies.