Occurrence of Psilocybin/Psilocin in Pluteus Salicinus (Pluteaceae) Mycologia July 1, 1981 Stephen G. Saupe 20 citations (1981). Occurrence of Psilocybin/Psilocin in Pluteus Salicinus (Pluteaceae) Mycologia: Vol. 73, No. 4, pp. 781-784. DOI: 10.1080/00275514.1981.12021406 (opens in new tab) Psilocybin Flatworm Hallucinogen Zoology +2