tsukubensis

Psilocybe tsukubensis is a species of mushroom in the family Hymenogastraceae. It is known for its psychoactive properties, containing psilocin and psilocybin as its primary active compounds. The mushroom is native to Japan, specifically found growing on dung and in pastures, often in humid environments. It is characterized by its small to medium size, with a conical to bell-shaped cap that is typically brown to yellowish-brown and a slender stem. Bruising blue is a common characteristic, indicating the presence of psilocin.

The species was first described by Japanese mycologist Tsuguo Hongo in 1959. The name "tsukubensis" is derived from Mount Tsukuba, a location in Japan where the species was discovered. Like other psilocybin-containing mushrooms, P. tsukubensis has been used traditionally for spiritual and ritualistic purposes in some cultures. Due to its psychoactive nature, the cultivation, possession, and distribution of P. tsukubensis are illegal in many countries. Research into the pharmacological effects and potential therapeutic applications of psilocybin continues, but these activities are strictly regulated. Misidentification of wild mushrooms can be dangerous, and accurate identification by experienced individuals is crucial.