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The genus Psilocybe:
Gastón Guzmán is a Mexican mycologist and anthropologist. He is considered the world's foremost authority on the genus Psilocybe. In 1971, he received a grant from the Guggenheim Foundation of New York, on the recommendation of Richard Evans Schultes to study the genus Psilocybe, which resulted in a comprehensive book on the subject in 1977. Entitled The Genus Psilocybe: A Systematic Revision of the Known Species Including the History, Distribution and Chemistry of the Hallucinogenic Species, it was published in 1983 by J. Cramer of Vaduz. He has since authored eight other books and over 350 papers on Mexican mushrooms and has described more than 200 new taxa of fungi worldwide. More than half of the known psilocybin mushroom species were discovered by Dr. Guzmán. [via]