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Psilocybe silvatica

Psilocybe silvatica is a psilocybin mushroom in the section Semilanceatae of order Agaricales. Psilocybin is the main active compound. The species is closely related to its European twin Psilocybe medullosa, which differs genetically, and the American Psilocybe pelliculosa, which can be distinguished by spore size and cheilocystidia shape.