Psilocybe squamosa

Psilocybe squamosa (Pers.: Fr.) P. D. Orton


synonyms:
Leratiomyces squamosus Bridge & Spooner 2008
Agaricus squamosus
Geophila squamosa
Hypholoma squamosum
Naematoloma squamosum
Psalliota squamosa
Stropharia squamosa
Stropholoma squamosum


probably nonactive

Macroscopic feat.:
  • Cap/Pileus: 3-8 cm broad. Conic or obtusely conic when young, with an incurved margin soon becoming broadly campanulate to convex, and often with a conic umbo. Viscid when moist from a separable gelationous pellicle, but soon drying. Yellowish brown to orangish brown overall. At first adorned with small squamules (scales) along the margin, but soon smooth and free of veil remnants. Flesh relatively thin and watery brown when wet.
  • Gills/Lamellae: Attachment adnate to uncinate, close to subdistant, moderately broad, with two to three tiers of intermediate gills inserted. Pallid bluish gray, then dark grayish brown to purple brown when fully mature.
  • Stem/Stipe: 60-120 mm long by 4-8 mm thick. Equal to slightly enlarged and curved at the base, hollow, and somewhat fragile. Whitish towards the apes and sordid brown to dense buff below the annulus. Surface covered with evanescent pallid to brownish recurved scales, often with orange-buff rhizomorphs protruding about the base. Partial veil membranous, fragile, leaving a superior membranous annulus, striated on the top side, often hanging broken around the stem or entirely absent in age.

Microscopic feat.:
  • Basidio/Spores: Dark grayish violet brown in deposit, subellipsoid, 11-15 by 7-8 µm with a central germ pore.
  • Basidia: 4-spored.
  • Cheilocystidia: 36-66 by 3.3-6 µm, filamentous to sublageniform, with an apex adorned with a glutinous mass.
  • Pleurocistidia: Absent.

Habitat: Solitary to scattered in the late summer and fall in meadows and mixed conifer and alder woods. Known from the Pacific Northwest, Minnesota, and California. It is likely this species is widely distributed across the continent.

Comment: There are conflicting reports on the edibility of Psilocybe squamosa; caution is definitely recommended. Once a Stropharia, this species lacks the chrysocystidia once typical of that genus. Both the squamules of the cap and the annulus are temporal features, and can soon disappear after heavy rains. See also Psilocybe thrausta, which is very similar but differs in the reddish coloration of the caps.

source - Paul Stamets "Psilocybin Mushrooms of the World"

Pictures at www.mushroomobserver.org

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