Psiiocybe samuiensis Guzman, Bandala & Allen is described as a new species from Koh Samui, Thailand.it belongs to the hallucinogenic fungi of the Section Mexicanae Guzman.This is the first record of a bluing Psilocybe from Thailand and the first species of the Section outside of the Americas.The form and size of the spores, the presence of pleurocystidia and the habit, similar to P....