Psilocybin Mushrooms · Psilocybe azurescens
Psilocybe azurescens
Psilocybe azurescens holds the documented record for highest psilocybin content of any naturally occurring mushroom species. Formally described by Stamets and Gartz in 1995, the species was discovered near the mouth of the Columbia River in Astoria, Oregon. It was subsequently found to grow at scattered locations along a narrow stretch of the Pacific Northwest coast.
Analytical data published by Stamets & Gartz (1995) reported psilocybin content of 1.78%, psilocin of 0.38%, and baeocystin of 0.35% by dry weight — substantially higher than P. cubensis and P. semilanceata in direct comparisons. These figures have been replicated in subsequent independent assays.
P. azurescens is a wood-loving species (lignicolous), associated with decaying wood chips, dune grass roots, and coastal debris. It fruits in autumn and early winter — unusually late in the season, fruiting prolifically after first frost. It is cold-tolerant in a way that most Psilocybe species are not.
Active Compounds
Psilocybin (up to 1.78% reported — highest of any known species), Psilocin, Baeocystin
P. azurescens produces medium-sized, caramel to chestnut-brown caps (3–10cm), broadly umbonate, and strongly hygrophanous (changing colour dramatically with moisture). The gills are dark cinnamon-brown to purple-brown with white edges. The stipe is long, silky-fibrous, and deeply bruises blue-green. Spore print is dark purplish-brown.
Natural range is restricted: concentrated near the mouth of the Columbia River in Oregon and Washington state, with isolated reports along the northern California, Oregon, and Washington coasts. The species has been introduced to naturalized cultivation in wood chip beds in suitable climates (PNW coast conditions).
Identification must be very confident — the Galerina and Pholiota genera contain look-alike wood-inhabiting species, some lethally toxic. A dark spore print combined with aggressive blue-bruising is the critical distinguishing pair of features.
Note: P. azurescens has been documented in Canada only rarely; it is not common in the Canadian wild.
- Scientific Name
- Psilocybe azurescens
- Potency
- Very High
- Origin
- Pacific Northwest coast — Columbia River mouth, Oregon/Washington (primary); rare in Canada