Wild Species Bluing ✓ Potency: ★★★☆☆

Psilocybe allenii

Common name: Allen's Psilocybe

Field Identification

Cap2–6cm; convex to broadly convex; caramel-brown to yellow-brown; hygrophanous; edge often wavy at maturity
GillsAdnate; initially pale, darkening to purple-brown
Stem4–8cm; whitish; silky; blue staining base
Spore PrintDark purple-brown
HabitatUrban wood chip mulch; garden beds, parks, trail edges; Pacific coast urban areas
DistributionPacific coast US (California, Oregon, Washington); very common in Bay Area garden mulch
SeasonOctober–February

Key Identification Feature

Very similar to Psilocybe cyanescens but with a less strongly wavy cap edge and slightly different habitat preference (P. allenii appears more frequently in California urban settings). Distinguished definitively by microscopy.

⚠ Dangerous Lookalikes

Psilocybe cyanescens (wavy cap, more northerly), Galerina marginata (DEADLY — same mulch habitat; ring; rusty spores), Hypholoma species (yellow-orange, no bluing)

Notes

Named in honor of John Allen (the mycologist and photographer who documented Southeast Asian Psilocybe collections including the Thai Koh Samui strain). One of the most abundant Psilocybe species in California urban environments. Ecologically linked to the spread of wood chip mulch in landscaping.

Legal Status Warning Psilocybin-containing mushrooms are controlled substances in most jurisdictions. This guide is for educational purposes only. Wild foraging for psilocybin mushrooms may be illegal in your location. Never consume wild mushrooms without positive identification from an expert mycologist — misidentification can be fatal.

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