Gymnopilus luteus

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Gymnopilus luteus
Gymnopilus luteus
Scientific classification
Kingdom: Fungi
Division: Basidiomycota
Class: Agaricomycetes
Order: Agaricales
Family: Cortinariaceae
Genus: Gymnopilus
Species: G. luteus
Binomial name
Gymnopilus luteus
((Peck) Hesler)

Pholiota lutea

Gymnopilus luteus
Mycological characteristics
gills on hymenium
32px cap is convex
32px 32px

hymenium is adnexed

or adnate
32px stipe has a ring
32px spore print is yellow-orange
32px ecology is saprotrophic
32px edibility: psychoactive

Gymnopilus luteus also called the "Yellow Gymnopilus" is a widely distributed mushroom of the Eastern United States, it contains the hallucinogens psilocybin and psilocin. Often mistaken for Gymnopilus junonius.


  • Pileus: 5 — 10(15) cm, Convex or nearly flat with an incurved margin that slightly overhangs the gills. Buff yellow to warm buff orange, often slightly darker towards the center, dry, smooth, silky or finely floccose-fibrillose, sometimes floccose-sqaumulose toward the center, flesh firm, pale yellow. Staining orange-brownish or sometimes bluish-green where injured or on age.
  • Gills: Adnexed, thin, close, pale yellow, becoming rusty brown with age.
  • Spore Print: Rusty brown.
  • Stipe: 4 — 8(9) cm, .5 — 1.5 cm thick, equal to slightly enlarging below, solid, firm, colored like the cap, developing yellowish-rusty stains when handled, finely hairy, partial veil usually forms a fragile submembraneous ring or fibrillose annular zone near the apex. Staining orange-brownish or sometimes bluish-green where injured or in age.
  • Taste: Bitter.
  • Odor: Pleasant.
  • Microscopic features: Spores 6 — 9 x 4 — 5(5.5) µm minutely warty, elliptical, dextrinoid, surface finely roughened, no germ pore. Pleurocystidia present, cheilocystidia scarcely projecting beyond the basidia, variously shaped. Caulocystidia absent. Clamp connections present.

Habitat and formation

Gymnopilus luteus is found growing solitary to gregariously or in small clusters on dead hardwood and possibly conifers, June - November, widely distributed in eastern North America.

See also

List of Gymnopilus species


  • Stamets, Paul (1996). Psilocybin Mushrooms of the World. Berkeley: Ten Speed Press. ISBN 0-9610798-0-0. 
  • Hesler, L. R. (1969). North American species of Gymnopilus. New York: Hafner. 117 pp.
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