americana, is a psilocybin mushroom in the family Hymenogastraceae.

It is in the section Semilanceatae of Psilocybe and has psilocybin as its main active compound.

americana is found scattered to gregarious in rich pastures or grasslands, fruiting from summer to early winter.

It has been collected in Washington, Oregon, and Michigan, and has also been reported from Chile where it fruits in the spring.

This mushroom is very close to the type variety; the main difference is the lack of a gelatinous layer on the edge of the lamellae and the terricolous habitat.