In 1958, he published his first paper on a blue-staining Psilocybe species and the first paper on the ecology of neurotropic fungi.
The encyclopedia features 168 detailed monographs on the major psychoactive plants (e.g., Cannabis, Datura, and Papaver) as well as 20 full monographs on psychoactive fungi (e.g., Psilocybe and Amanita).
In addition to Agaricus the species has been placed in Coprinus, Geophila, Psalliota, and Psilocybe.
Psilocybe graveolens is an extremely rare psilocybin mushroom in the section Zapotacorum, which has psilocybin and psilocin as main active compounds, discovered in the salt marshes or "meadows" of Hackensack, New Jersey.
In 1958 Roger Heim described this fungus as Psilocybe wassonii, but without any Latin designation; Rolf Singer and Alexander Hanchett Smith described it in the same year as Psilocybe muliercula (muliercula = "little women").
For almost two decades after its discovery, Psilocybe tampanensis was known only from the type locality, southeast of Brandon, Florida.