Psilocybe magnivelaris

Psilocybe magnivelaris (Peck) Noordel. 1995

Leratiomyces magnivelaris (Peck) Bridge & Spooner
Psilocybe percevalii (Berkeley i Broome) Orton
Stropharia percevalii (Berkeley i Broome) Saccardo
Stropharia magnivelaris Peck
Nematoloma magnivelaris (Peck) Singer


Macroscopic feat.:
  • Cap/Pileus: 1,5-6 cm broad. Obtusely umbonate to campanulate to convex, expanding to broadly convex to plane and often umbonate, with an elevated margin in age. Surface viscid when moist from a thin gelatinous pellicle, smooth, covered with scattered, white, floccose scales, increasing towards margin. Pale grayish yellow to ochraceous to brownish orange, and darker towards the disc, not strongly hygrophanous.
  • Gills/Lamellae: Attachment adnate to sinuate, broad, close, pallid, white at first, soon grayish brown and finally dark purplish brown with whitish fringed margins.
  • Stem/Stipe: 50-85 mm long by 4-7 mm thick. Hollow, equal to enlarged towards the apex and tapering below. White to dingy yellowish. Partial veil membranous, leaving a thick, white membranous annulus, often flaring, which can deteriorate into an annular zone, below which the surface can be covered with fibrillose patches. Flesh moderately thick, firm, whitish, and not bruising.

Microscopic feat.:
  • Basidio/Spores: Dark purplish brown in deposit, smooth, ellipsoid 13-15 by 6-8 µm.
  • Basidia: 4-spored.
  • Pleurocistidia: Absent.
  • Cheilocystidia: 33-44 by 4-5 µm, nearly clavate to sublageniform, with an elongated neck 3-4 µm thick.

Habitat: Scattered to gregarious, preferring sandy soils, alluvial plains, and/or soils rich in woody debris of Salix (willow) and Almus (alder). Found from May to November in the United States (Alaska, Washington, Oregon, possibly Colorado), northern Europe, and the British Isles. Likely to be much more widely distributed than presently reported.

Comment: Not active, edibility unknown. The well-developed membranous annulus, the nonbluing flesh, its modest size, and its habitat, all give clues to its identification. This mushroom is similar to Psilocybe squamosa and Psilocybe thrausta, and can be separated with certainty by the length of the cheilocystidia. Stropharia riparia is generally similar. See also Psilocybe subaeruginascens.

source - Paul Stamets "Psilocybin Mushrooms of the World"

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© psilosophy 2001-2022