Psilocybe azurescens is a psychedelic mushroom whose main active compounds are  psilocybin and psilocin. It is among the most potent of the tryptamine-bearing mushrooms, containing up to 1.8% psilocybin, 0.5% psilocin, and 0.4% baeocystin by dry weight, averaging to about 1.1% psilocybin and 0.15% psilocin, makes it one of the strongest mushrooms in psilocybe genus. It belongs to the family Hymenogastraceae in the order Agaricales. In one study Psilocybe subaeruginosa (Cleland) collected in Victoria, Australia had up to 1.93% PSOP. Perkal 1981, which would indicate that Psilocybe subaeruginosa could be even more potent than its close cousin depending on where it is collected and the strain.