koh samui mushrooms was first picked in soil containing mixtures of sand and clay west of the village of Ban Hua Thanon, in Koh Samui. Since then it is now known to occur in Ranong Province in Thailand and also at Angkor Wat in Siem Riap, Kampuchea; and verified by Gaston Guzman. It grows scattered to gregarious in rice paddies, but never directly on manure, fruiting from early July to late August. Gastón Guzmán mistakenly noted that the species was known only by the native children who collect psychoactive fungi for sale. Only three local children observed John W. Allen harvesting fresh specimens of the species, yet days later could not remember said species..
koh samui mushrooms