Psilocybe merdaria

Psilocybe merdaria (Fr.) Ricken


synonyms:
Agaricus merdarius Fr.
Stropharia merdaria (Fr.) Quél.
Geophila merdaria (Fr.) Quél.
Fungus merderius (Fr.) Kuntze
Psalliota merdaria (Fr.) Henn.
Deconica merdaria (Fr.) Noordel.


nonactive

Macroscopic feat.:
  • Cap/Pileus: 1-4 cm broad. Campanulate-hemispheric to convex to broadly convex, and sometimes slightly umbonate, finally expanding to place with age. Margin translucent-striate when moist, and often appendiculate with remnants of the thin partial veil. Cinnamon brown to livid brown when moist, fading to ochraceous or yellowish brown, and remaining darker at the disc. Surface smooth and only moist to subviscid when wet.
  • Gills/Lamellae: Attachment adnate to subdecurrent, close to broad. Yellowish at first, darkening with spore maturity to a dark brown.
  • Stem/Stipe: 20-40 mm long by 1-3 mm thick. Pale yellowish to pallid. Surface covered by fine, dry fibrils. Flesh stuffed with a fibrous pith, tough, but soon becoming hollow. Partial veil thinly membranous, fugacious, soon deteriorating to an annular zone of fibrils in the median to lower regions of the stem, usually darkened by spores.

Microscopic feat.:
  • Basidio/Spores: Dark purple-brown in deposit, subellipsoid, 10-14 by 7-9 µm.
  • Basidia: 4-spored.
  • Pleurocistidia: Absent.
  • Cheilocystidia: 20-33 by 6.6-8.8 µm, fusoid-ventricose to sublageniform with a short neck 3.3-4.4 µm thick.

Habitat: Scattered to numerous on dung. Reported from California, Oregon, Washington, and the northern Midwest of the United States. Widely spread throughout the world, this mushroom has been collected in Canada, Europe, the former USSR, and Japan. Psilocybe merdaria is probably more widespread than the literature presently indicates. It prefers a temperate zone..

Comment: Not known to be active; not sufficiently studied for chemical content. In temperate zones, Psilocybe merdaria is common dung dweller, along with Psilocybe semiglobata and Psilocybe papilionaceus. The annulus is typically located in the lower regions of the stem, or at most mid distance, but not superior. This species is virtually identical to Psilocybe moelleri, which has larger spores: 13-14 (16) by 7-8 µm. See also Psilocybe coprophila and Psilocybe subviscida.

source - Paul Stamets "Psilocybin Mushrooms of the World"

Pictures at www.mushroomobserver.org

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