Psilocybe weilii

Psilocybe weilii Guzmán, Stamets & F. Tapia



Macroscopic feat.:
  • Cap/Pileus: 2-6 cm broad. Campanulate to bluntly conic with an inrolled margin when young, then incurved, often with an irregular, soon expanding to broadly convex to nearly plane, to uplifted in age. Dark chestnut brown to deep olivaceous brown, typically with a blackish brown zone around the disc, where flesh is 3-4 mm thick at its center. Strongly hygrophanous, fading in drying to pallid brown to light brown. Flesh whitish, bruising bluish. Surface viscid when moist from a separable gelatinous pellicle, translucent-straite near the margin, which can split in age and become tough and opaque in drying.
  • Gills/Lamellae: Attachment adnate to sinuate with two tiers of intermediate gills, close, even, broad, light brown overall with pallid, floccose edges. Becoming dark chocolate brown at maturity.
  • Stem/Stipe: 25-70 mm long by 4-8 mm thick. Equal, swelling towards the base, which projects white rhizomorphs. White, becoming dingy brown, bruising bluish overall in age or from drying, covered with a well-developed sheath of whitish fibrillose patches below, and pruinose above. Cartilaginous, strigose, hollow, stuffed with a whitish pith. Partial veil cortinate, leaving a fibrillose annular zone sometimes dusted with purplish violet-brown spores.

Microscopic feat.:
  • Basidio/Spores: Dark violet grayish black in deposit, subellipsoid in side view, subrhomboid to subellipsoid in face view, 5.5-6.5 by 4-5 µm in side view.
  • Basidia: 4-spored.
  • Pleurocistidia: Abundant, subfusoid or ventricose-rostrate with short apex, or sublageniform, 10.5-21.5 (24) by 5-9.5 (10.5) µm.
  • Cheilocystidia: Lageniform with short, single, or branched neck, 20-37.5 by 5-6.5 µm.

Habitat: Gregarious to cespitose, sometimes scattered in red clay soil topped with a thin layer of needles from loblolly pine (Pinus taeda) underneath sweetgum (Liquidambar styraciflua). First reported from southeastern Cherokee County, in northern Georgia, after hurricane Opal swept through in 1995. Fruiting from early September through November, between temperatures of 45°-80°F, preferring 60°C-75°.

Comment: 0.61% psilocybin, 0.27% psilocin, 0.05% baeocystin, and 0.32% tryptophan. This is the first report of a lignicolous, caerulescent Psilocybe from Georgia. The association with pine needles, along an interface ecosystem (just beyond the edge of an eight-year-old yard lined with shrubs, and in red-clay soils), are habits typical of many other Psilocybes. Additionally, the strong bluing reaction and its tendency to form clusters are characteristics also shared with Psilocybe caerulescens, Psilocybe baeocystis, Psilocybe aztecorum and Psilocybe heliconia. The name Psilocybe weilii is being reserved as a provisional name (nom. prov.) until the name is published in a mycological journal. (Guzmán, Tapia, and Stamets 1996). The name honors Andrew Weil and his role in promoting the beneficial properties of mushrooms.

source - Paul Stamets "Psilocybin Mushrooms of the World"

Pictures at www.mushroomobserver.org

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