Inocybe corydalina is a rare and very weakly active psilocybin-producing mushroom of the large Inocybe genus. It is widely distributed in temperate forests of Europe and North America where it spreads through its symbiotic relation with plants.
Inocybe corydalina, has two known varieties: Inocybe corydalina var. corydalina and Inocybe var. erinaceamorpha. Researches argue that both of the corydalina varieties are psilocybin-producing, Inocybe corydalina var. erinaceamorpha having tested positive to containing the poisonous compound muscarine. Unfortunately, the result was not confirmed by other researches and the limited collection of specimen limits production of new data. Other chemical analyses show a rather weak concentration of psilocybin, often no psilocin and a fairly high level of baeocystin.
This is yet another good example of the risky minefield of the Inocybe genus with over 1400 species of edible, psychoactive and poisonous mushrooms mixed, identification is tricky, and mistakes can be deadly.