“How do I know if a mushroom is a psilocybin producing species or not?” “If a gilled mushroom has purplish brown to black spores, and the flesh bruises bluish, the mushroom in question is very likely a psilocybin-producing species.” This is definitely a big help, though I wouldn’t mind something more categorical than “very likely.” He then offers a sobering caveat. “I know of no exceptions to this rule,” he adds, “but that does not mean there are none!”
