Psilocybe guilartensis

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Psilocybe guilartensis is a psychoactive mushroom that contains the compounds psilocybin and psilocin. It is common in Puerto Rico and has also been found in the Dominican Republic. It was first described in 1997 by Guzmán, Tapia, and Nieves-Rivera.

Habitat and ecology: It grows in groups on disturbed bare clay or moss, often along hiking trails, in coffee plantations, and in tropical and subtropical forests, especially in landslide areas. It is saprotrophic, feeding on decaying matter.

Taxonomy: Kingdom Fungi; Division Basidiomycota; Class Agaricomycetes; Order Agaricales; Family Hymenogastraceae; Genus Psilocybe; Species guilartensis.

Mycological characteristics: the cap is conical or convex; gills on the hymenium; the stipe is bare; the spore print is purple-brown; the hymenium is adnexed.

Taxonomic note: Guzmán placed P. guilartensis in Psilocybe section Brunneocystidiatae because of its blue-staining reaction, small thick-walled subrhomboid spores, and pigmented cystidia.