Closely related to Psilocybe zapotecorum, this mushroom prefers a similar habitat -- rich, dark soils in marshy areas -- where it can be found fruiting throughout summer in small groups or dense clusters.
In 1979 Guzman, along with Stephen H. Pollock, described a new entheogenic species found by them in the Naolinco region of the State of Veracruz, Mexico. This mushroom prefers rich soils in deciduous forests where it can be found fruiting singly or in small groups. The pseudorhiza at the base of the stalk is characteristic. This species was named Psilocybe wassoniorum to honor Wasson and his wife Valentina, and to remedy the nomenclatural dispute regarding Psilocybe wassonii.
 
Guzman, G. "El habitat de Psilocybe muliercula Singer & Smith (=Ps. wassonii Heim), agaricaceo alucinogeno mexicano." Revista de la Sociedad Mexicana de Historia Natural 19: 215-229 (1958).
 
 
 
Guzman, G. The Genus Psilocybe: A Systematic Revision of the Known Species Including the History, Distribution and Chemistry of the Hallucinogenic Species. Beihefte zur Nova Hedwigia Heft 74. J. Cramer, Vaduz, Germany (1983).
Guzman, G. "Wasson and the development of Mycology in Mexico." In: Riedlinger, T.J. (Ed.) The Sacred Mushroom Seeker: Essays for R. Gordon Wasson. Ethnomycological Studies No. 11, pp. 83-110. Dioscorides Press, Portland, OR (1990).
Guzman, G. and S.H. Pollock. "Tres nuevas especies y dos nuevos registros de los hongos alucinogenos en Mexico y datos sobre su cultivo en el laboratorio." Bol Soc Mex Mic 13: 261-270 (1979).
Heim, R. "Diagnose latine du Psilocybe wassonii Heim, espece hallucinogene des Azteques." Revue de Mycologie 23(1): 119-120 (1958).
Heim, R. and R.G. Wasson. Les Champignons Hallucinogenes du Mexique. Etudes Ethnologiques, Taxinomiques, Biologiques, Physiologiques et Chimiques. Archives du Museum National d'Histoire Naturelle, Series 7, Vol. VI. Paris, France (1958).
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