Psilocybe bispora is described as a new caerulescent species from Antioquia, Colombia. The species is characterized by having two types of basidiospores: subrhomboid thick walled, and subellipsoid thin-walled, when observed in face-view. Psilocybe bispora belongs to a new section of the genus, section Bisporae, here described. Both the species and the section belong to the hallucinogenic...