Psilocybe baeocystis because of its distinctive rippled cap, with baeo-cystis translating to “small-bladder,” something that resembles the fungus when fresh. It is found more frequently under the aliases of “bottle caps,” “knobby tops,” “blue bells” or “olive caps;” all references to the different cap traits. Together with the wavy ripples, when treated or aged, the cap stains quickly from a chestnut-brown, olive-green to a shiny dark blue.
A relative oddity with respect to this species is that its potency is markedly higher when fresh, usually diminishing with drying to at least half. This can be due to the very high levels of baeocystin, a psychoactive psilocybin precursor.
This compound, popular within Psilocybe but usually at far lower rates, is named for the mushroom itself, being first identified and described from the genus.
Along with the compound sharing its nickname, P. baeocystis also boasts psilocin levels that place it in the top three. While the psilocybin content is close to P. cubensis, moderate to low, this species also contains a small but effective amount of norbaeocystin, a similar alkaloid to the rest. All together, this makes for a very potent mushroom when fresh: 1-3 mushrooms or up to five grams would be a large dose. A sample of just one gram will produce lively effects when dried.