At Coll. Pharm., Univ. Wash., Seattle, identification of psilocybin in Gonocybe cyanopus extends the reported occurrence of this compound which (with or without psilocin) was, with the exception Paneolus sphinctrinus, believed to be confined to Psilocybe (sect. Caerulescentes).
Benedict, R. G., et al. (1962). “Occurrence of psilocybin and psilocin in certain Gonocybe and Psilocybe species.” Lloydia 25(3): 156-159.