Psilocybe quebecensis is a moderately active hallucinogenic mushroom in the section Aztecorum, having psilocybin and psilocin as main active compounds.

[1] Macroscopically this mushroom somewhat resembles Psilocybe baeocystis.

Solitary to gregarious, rarely cespitose, on rotting wood, particularly in the outwashes of streams in the decayed-wood substratum of alder, birch, fir and spruce in the late summer and fall.

Reported from Quebec, Canada specifically in the Jacques-Cartier River Valley, fruiting at a temperature of 6 to 15 °C (43 to 59 °F) from summer to late October.

Originally discovered in 1966, P.Quebecensis has also been confirmed growing in at least one area within Cape Breton, Nova Scotia.