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Gymnopilus junonius

Common name: Spectacular Rustgill

Field Identification

Cap5–20cm; convex to broadly umbonate; bright golden-yellow to rusty orange; fibrous-scaly surface; impressive size
GillsAdnate; bright yellow, becoming rusty orange with spore maturity; fairly crowded
Stem5–15cm tall, 1–3cm thick; fibrous; yellow-orange; prominent fibrous ring (annulus)
Spore PrintRusty orange — a key identification feature distinguishing from Psilocybe species
HabitatBases of hardwood trees, stumps, buried wood; occasionally conifers; forests and urban parks
DistributionCosmopolitan — North America, Europe, Japan, Australia; one of the most widespread psychoactive fungi
SeasonLate summer to autumn (August–November in Northern Hemisphere)

Key Identification Feature

Low; bitter taste deters overconsumption; not all specimens are equally active

⚠ Dangerous Lookalikes

Armillaria (honey fungus) — non-psychoactive; Pholiota species; check for rusty-orange (not purple-brown) spore print

Notes

Gymnopilus junonius is the largest commonly encountered psychoactive mushroom, sometimes growing in massive clusters on wood. The stunning golden-orange caps make it highly visible. Despite its size and wide distribution, it is underappreciated as a psychedelic mushroom because potency varies significantly — some specimens produce strong effects while others from the same habitat produce none. The orange spore print is the most important identification feature distinguishing it from dangerous lookalikes. Gymnopilus species were documented as psychoactive by Japanese researcher Tsunoda in the 1960s after traditional use reports from Japan and Mexico.

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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