Psilocybe thaiaerugineomaculans 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 in cow dung in the Chiang Mai University Park in Thailand, this tropical coprophilous mushroom is to this day quite an enigma.
Because of certain morphological features such as the annulus on the stipe and its thick-walled spores, P. thaiaerugineomaculans was placed in section Stuntzae of the Psilocybe genus.
Guzmán believes that a picture of it is featured in Paul Stamet’s book “Psilocybin Mushroom of the World” at page 171 entitled “Mysterious, unidentified Psilocybes”. If that is the case, it has a white stem with a strong blue-green hue when bruised, similar to Psilocybe stunzii (aka Blue Legs) which could explain its epithet that contains the Latin root “aeru- “ meaning “blue-green”.
Nonetheless, by its epithet, we know P. thaiaerugineomaculans is a close relative to Psilocybe aerugineomaculans and P. subaeruginascens.
One wonders if, like Inocybe aeruginascens, it contains the rare aeruginascin compound; the latter is analog to psilocybin and is closely related to the frog skin toxin bufotenine (5-HTQ), a potent 5-HT3 receptor agonist. This compound, identified by chemist and mycologist Jochen Gartz in the eighties, is believed to be the equivalent of what CBD is to THC. Unfortunately, data on this exotic Psilocybe is rare, but maybe its spores have already made it to the world of in-vitro mushroom manipulation.