Psilocybe subfimetaria

Psilocybe subfimetaria Guzmán & A.H. Sm.

Psilocybe sierrae Singer

Macroscopic feat.:
  • Cap/Pileus: 0.5-2 cm broad. Conic to campanulate, expanding with age to broadly campanulate but not sharply umbonate. Surface smooth, viscid when moist from a separable gelatinous pellicle, and translucent-striate near the margin. Ochraceous brown to olive brown, hygrophanous, fading in drying to a straw color. Flesh whitish, bruising bluish where injured.
  • Gills/Lamellae: Attachment adnexed, clay becoming violaceous brown, with whitish edges.
  • Stem/Stipe: 25-45 mm long 2-3 mm thick, equal to slightly enlarged towards the base, white to dingy white or pallid, bruising bluish where injured. Well-developed partial veil cortinate, usually leaving a fibrillose annular zone that can approach a true annulus in the upper regions of the stem. Flesh whitish, bruising bluish.

Microscopic feat.:
  • Basidio/Spores: Dark violaceous brown in deposit, subellipsoid in face view, and subellipsoid, sometimes irregularly so, in side view, 10-14 by 6.6-7.7 µm.
  • Basidia: 4-spored.
  • Pleurocistidia: Absent.
  • Cheilocystidia: 20-28 by 5-6.6 µm, fusoid-ventricose or more frequently lageniform with an extended neck 1-2 1-2 µm broad.

Habitat: Solitary to gregarious on dung, primarily in grassy areas. Reported from locations near Siltcoos Station, Oregon, and Vancouver, British Columbia in October through November, and near Chovetten, Chile, in August. Probably much more extensive in its distribution than presently realized. I have found this species in habitats also supporting Psilocybe semilanceata and Psilocybe liniformans.

Comment: Active, but I do not know how potent. This mushroom resembles Psilocybe semilanceata and is definitively separated from it by microscopic features. Macroscopically, this species is distinguished from Psilocybe semilanceata if the annulus of Psilocybe subfimetaria persists into maturity. Furthermore, Psilocybe semilanceata is sharply umbonate, while Psilocybe subfimetaria is not. Psilocybe subfimetaria is a relatively rare species and is very close microscopically to Psilocybe fimetaria, from which it is separated by spore size. Also, Psilocybe subfimetaria often grows directly out of dung, while Psilocybe semilanceata prefers grasses. (Manured grasslands can make this judgment difficult.) The overall aspect, fairly persistent annular zone, and nonpapillate cap can help narrow the field of candidates to Psilocybe subfimetaria. See also Psilocybe stuntzii var. tenuis.

source - Paul Stamets "Psilocybin Mushrooms of the World"

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