Wild Species Bluing ✓ Potency: ★★☆☆☆

Inocybe aeruginascens

Common name: Verdigris Inocybe

Field Identification

Cap2–5cm; conical to broadly umbonate; pale gray-brown to olive-gray; silky-fibrous surface; dry
GillsAdnate; pale gray becoming brownish-gray at maturity; crowded
Stem3–8cm; robust for Inocybe; pale grayish; silky-fibrous; characteristic blue-green coloration at base (giving 'aeruginascens' — verdigris green name)
Spore PrintPale brown (rust/tobacco-brown) — notably NOT dark purple-brown; this is a critical identification difference from Psilocybe
HabitatSandy soils in parks, gardens, and urban green spaces; deciduous woodland edges; often under poplar, willow, and linden trees
DistributionCentral Europe (Germany, Hungary, Czech Republic, Netherlands, Belgium); extends into parts of Eastern Europe; increasingly documented in urban parks
SeasonMay–October; one of the earlier-fruiting psychoactive species

Key Identification Feature

Pale brown (not purple-brown) spore print combined with blue-green base coloration and urban sandy soil/park habitat is the identification combination. The blue-green staining is unusual in Inocybe and is the source of the species epithet.

⚠ Dangerous Lookalikes

Other Inocybe species (many are TOXIC; pale brown spores; no bluing), Psilocybe species (dark purple-brown spores; bluing pattern differs), Cortinarius species (rusty spores; cobweb veil remnants)

Notes

Inocybe aeruginascens is exceptionally important from a taxonomic perspective: it's one of the few confirmed psilocybin-containing mushrooms outside the traditional Psilocybe-Panaeolus-Gymnopilus genera. Its occurrence primarily in Central European urban parks (often in children's play areas) has resulted in accidental ingestions, particularly by children who mistake the mushrooms for edible species. Its pale brown (not purple-brown) spore print is the single most important safety detail: it demonstrates that the traditional 'purple-brown spores = psilocybin' identification heuristic has exceptions. This species is primarily an educational data point rather than a foraging target.

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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