Revised January 9, 2005; October 11, 2007; and April 8, 2013.
Copyright 1998-2013 by John W. Allen.

Psilocybe cyanofibrillosa

Psilocybe cyanofibrillosa Guzmán and Stamets. Photo: Paul Stamets.


Cap: 1-4 x 3.5 cm broad. Conic to convex to broadly convex. Plain in age. Deep chestnut brown, hygrophanous, fading to pale tan or yellowish brown or grayish white in drying. Viscid when moist with a separate pellicle.

Gills: Adnate to adnexed. Light grayish when young becoming purplish brown in age with white edges.

Stem: 30-70 mm long x 2-4 mm thick. Straight, enlarged at base with fibrills. Bruising blue when damaged.

Spores: (9) 9.5-11 (12) x (5.5) 6-6.6 (7)µ.

Sporeprint: Purplish brown.

Habitat: Scattered to gregarious among bush lupines in alder and willow wood chips and bark mulch. Common among rhododendron gardens and nurseries and flood plains near river estuaries.

Distribution: From northern California (Eureka/Arcada) north to British Columbia, Canada.

Season: September to December.

Dosage: 1 large specimen, 2 to 5 small specimens. High in psilocin and low in psilocybin. Loses over 70% or more of their potency in drying.

Comment: A few hundred pounds of this species mixed with Psilocybe cyanescens was collected from

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