Seven taxa of agarics reported in literature to contain psilocybin (viz. Psathyrella candolleana, Gymnopilus spectabilis, G. fulgens, Hygrocybe psittacina var. psittacina and var. californica, Rickenella fibula, R. swartzii) have been analysed for psilocybin and related tryptamines with negative results.

Persoonia - Molecular Phylogeny and Evolution of Fungi

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Naturalis journals & series

Stijve, T., & Kuyper, T. (1988). Absence of psilocybin in species of fungi previously reported to contain psilocybin and related tryptamine derivatives. Persoonia - Molecular Phylogeny and Evolution of Fungi, 13(4), 463–465.