Psilocybe thrausta

Psilocybe thrausta (Schulz.ex Kalchbr) Bon

Psilocybe thrausta (Schulzer ex Kalchbremer) Orton
Psilocybe squamosa var. thrausta (Schulzer ex Kalchbremer) Guzmán
Stropharia thrausta (Schulzer ex Kalchbremer) Bon


Macroscopic feat.:
  • Cap/Pileus: 3-7 cm broad. Obtusely conic at first, soon becoming convex to broadly convex, and finally nearly plane with or without an umbo. Viscid when moist from a gelatinous pellicle that is usually separable, soon drying. Surface adorned with whitish, floccose scales, especially near the margin. Orangish red to reddish brown or brick red. Margin initially ornamented with small scales, soon becoming smooth.
  • Gills/Lamellae: Attachment adnate to adnexed, or sinuate, sometimes uncinate, close to subdistant, moderately broad, with two to three tiers of intermediate gills. Pallid gray at first, soon becoming grayish brown and eventually dark purplish brown when fully mature.
  • Stem/Stipe: 50-100 (120) mm long by 3.7 (8) mm thick. Nearly equal to swollen and often curved at the base. Hollow in age. Pallid towards the apex and more brownish below. Covered at first with small brown to reddish brown floccose scales to the annulus, and usually with orangish rhizomorphs protruding about the base. Partial veil membranous, fragile, leaving a superior membranous annulus often absent in age.

Microscopic feat.:
  • Basidio/Spores: Grayish purplish brown in deposit, close to Psilocybe squamosa, in size, but with an eccentric germ pore, 11-14 by 6.6-8.5 µm.
  • Basidia: 4-spored.
  • Pleurocistidia: Absent.
  • Cheilocystidia: (36) 44-66 by 3.3-6 µm, sublageniform to filamentous, submucronate, with an extended and flexuous neck, 3-4 µm.

Habitat: Scattered in the fall in decayed wood substratum or wood debris. Reported from the United States (the Pacific Northwest, New York, Maryland), Japan, and northern to central Europe. Probably more widely distributed across the world.

Comment: Not active, edible according to some, but not palatable. Høiland (1978) detected no psilocybin. This species was once considered a variety of Stropharia squamosa (now a Psilocybe) and is very similar to it in appearance, differing in the cap coloration.

source - Paul Stamets "Psilocybin Mushrooms of the World"

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