Psilocybe yungensis

Psilocybe yungensis Singer & A.H.Sm. (1958)


synonyms:
Psilocybe yungensis var. diconica A.H.Smith (1958)
Psilocybe acutissima Heim (1959)
Psilocybe chiapanensis Guzmán (1995)
Psilocybe isauri Singer (1959)
Psilocybe subyungensis Guzmán (1978)

Macroscopic feat.:
  • Cap/Pileus: (0.5) 1-2 (2.5) cm, conic to campanulate at maturity, often adorned with a sharp umbo. Surface smooth, viscid, and translucent-striate most of the way to the disc when moist, pellicle not separable. Rusty brown to orangish brown to dark reddish brown, hygrophanous, fading in drying to dull yellowish brown or dingy straw colored. Bruising bluish where injured, and then blackish in drying.
  • Gills/Lamellae: Attachment adnate to adnexed, close to crowded, dull gray at first, soon purplish brown with spore maturity. Edges pale to nearly concolorous with gill surface.
  • Stem/Stipe: (25) 30-50 (60) mm long by 1.5-2.5 (3) mm thick, equal to enlarging towards the base. Surface covered with a sheath of dense whitish fibrils, pale brownish above and reddish brown to reddish brown-black near the base. Flesh bruising bluish, hollow, and fairly brittle. Partial veil cortinate, soon disappearing with maturity, leaving whitish fibrils along the cap margin and scant remnants on the upper regions of the stem.

Microscopic feat.:
  • Basidio/Spores: Dark purplish brown in deposit, rhomboid to subrhomboid to subellipsoid, (4.4) 5-6 (7) by 4-6 µm.
  • Basidia: 4-spored.
  • Pleurocistidia: 14-25 by 4.4-10.5 µm, ventricose below and mucronate at the apex.
  • Cheilocystidia: 14-33 by 4.4-7.7 µm, variable, ventricose to clavate to strangulated.

Habitat: Most frequently found in clusters or gregariously on rotting wood, sometimes at the bases of stumps, in coffee plantations or subtropical forests at 1000-2000 meters. Reported from Colombia and Ecuador, and extending north to Mexico. In June and July. Also reported from Bolivia in January. Probably more widely distributed than presently known.

Comment: Moderately active; analyses not available. This mushroom is distinct for its penchant for growing in great numbers on decomposing stumps or wood debris, its orangish color, and that the caps remain conic at maturity. I find the common name especially revealing. Few species resemble Psilocybe yungensis. See also Psilocybe aztecorum.

source - Paul Stamets "Psilocybin Mushrooms of the World"

Pictures at www.mushroomobserver.org

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