Gastón Guzmán Huerta (August 26, 1932 – January 12, 2016), a Mexican mycologist and anthropologist, was an authority on the genus Psilocybe.
His interest in mycology began in 1955 when as a graduate student he decided to update his school's (National Polytechnic Institute) poorly kept collection of fungi.
In 1971, he received a grant from the Guggenheim Foundation of New York City, on the recommendation of Richard Evans Schultes[1] to study the genus Psilocybe, which resulted in a comprehensive monograph on the subject in 1983, titled The Genus Psilocybe: A Systematic Revision of the Known Species Including the History, Distribution and Chemistry of the Hallucinogenic Species.
Guzmán held an emeritus research chair at the Ecological Institute of Xalapa where he founded the Department and Herbarium of Fungi which now has more than 50,000 specimens.
In 1955 he founded the Mycological Herbarium at the National School of Biological Sciences (ENCB) in Mexico City.