Psilocybe naematoliformis, is a species of fungus in the mushroom family Strophariaceae. It is a psilocybin mushroom, having psilocybin and psilocin as the main active hallucinogenic compounds. It was originally found by mycologist Gastón Guzmán in a tropical rain forest at Uxpanapa Region, in the State of Veracruz in southeastern Mexico. P. naematoliformi is in the section Neocaledonicae, a grouping of related fungi in the Psilocybe genus; other members of the section include Psilocybe aequatoriae (Ecuador), Psilocybe neocaledonicu'm (New Caledonia), and Psilocybe neorhombispora (Mexico).