Psilocybe subcaerulipes

Psilocybe subcaerulipes (commonly known as Hikageshibiretake in Japanese) is a species of fungus in the family Strophariaceae. It is in the section Zapotecorum of the genus Psilocybe, other members of this section include Psilocybe muliercula, Psilocybe angustipleurocystidiata, Psilocybe aucklandii, Psilocybe collybioides, Psilocybe kumaenorum, Psilocybe zapotecorum, Psilocybe pintonii, Psilocybe graveolens, Psilocybe moseri, Psilocybe zapotecoantillarum, Psilocybe zapotecocaribaea, and Psilocybe antioquiensis. It is endemic to Japan. Fruit bodies grow on the ground in woody debris, and typically stand 6 to 8 cm (2.4 to 3.1 in) tall with caps that are 2.5 to 5 cm (1.0 to 2.0 in) in diameter. They are chestnut brown (or lighter brown if dry), and stain blue if bruised or handled. The species is a psychoactive mushroom, and contains the hallucinogenic compounds psilocybin and psilocin. There have been reports of poisoning caused by the accidental consumption of this mushroom. It has been used in research, specifically, to test the effects of its consumption of marble-burying in mice, an animal model of obsessive-compulsive disorder.