Psilocybe thaiduplicatocystidiata is a species of psilocybin mushroom in the family Hymenogastraceae. It was described as new to science in 2012 by renown Mexican mycologist Gaston Guzmán and his colleagues.
Found growing at the Chiang Mai University Park, this subtropical rainforest mushroom is yet another enigmatic example of the rich mycota of Thailand.

It is a special member of the section Cordisporae Guzmán because it has been observed to have two types of both pleurocystidia and cheilocystidia, one as pseudocystidia, a feature said to not have been previously observed in that section. Its epithet translates this unique characteristic along its origins from Thailand.
It is said to have similarities to P. caerulescens Murrill, and P. wrightii Guzmán, both species are only known from the neotropics.The psychotronic fungal species in Thailand, as in most tropical countries, are poorly known, a drastic contrast to the richness of the mycoflora. With considerable destruction of tropical habitats, many species will likely disappear before being documented.

Guzmán and his team noted that on a five-day excursion, they found four new species yet none of the five species previously reported from the country.
This demonstrates the complexity of mushroom fructification and at same time the richness of the mycota in the tropics. They confirmed that species of Psilocybe of section Cordisporae, Mexicanae, Stuntzae, and Zapotecorum are tropical or subtropical.

Visual Description

• Cap: 20-40 mm broad. Convex to subumbonate or subumbilicate. Surface is smooth. Margin slightly striate. Cap is sub-hygrophanous, coloration is pale brown or brownish rose to brownish dull orange at the center, pale yellowish brown when dry, bluing to becoming irregularly blackish chocolate. • Gills: attachment adnate to seceding. Coloration black-violaceous to blackish chocolate, with white edges. • Stem: 45–75 mm long by 4–6 mm thick. Equal, hollow to stuffed. Coloration white to pale to dark reddish brown, or pale grayish brown when dry. Surface smooth above to sub-floccose below. Flesh bruised bluish. • Microscopic features: 9–10(–11) × 6.5–7(–8) × 5.5–6.5 μm. • Taste and odor: the taste of dried material becoming strongly pungent after some minutes.

Habitat Origin

Gregarious, on soil with rotting dung, in an open grassland, at 300 m elevation. Known only from the type locality, Chiang Mai, Thailand.