Psilocybe meridensis

Psilocybe meridensis Guzmán



Macroscopic feat.:
  • Cap/Pileus: (10-) 15-30 mm diam, conical to convex or subcampanulate, subpapillate or subumbonate, lubricous, even, slightly striate at the margin, yellowish brown or reddish brown, becoming paler towards the margin, readily turning blue-green to blackish when bruised or old.
  • Gills/Lamellae: Adnate or sinuate, yellowish gray to brownish violet or dark brown sepia, edges whitish and subfloccoses; turning blue-green to blackish when bruised.
  • Stem/Stipe: 40-80 x 3-5 mm, equally cylindrical or slightly thickened at the base, somewhat flexuous, hollow, whitish to irregularly reddish brown or blackish, readily turning blue-green when injured, covered by whitish floccose little scales, mainly toward the base. Veil well developed, cortinate and white, forming a complex subfibrillose or submembranous annulus, frequently double.
  • Context: Context pallid yellow in the pileus and stipe, whitish toward the pileus surface, readily turning blue-green to blackish when cut. Dried basidiomata are completly blackish to black.
  • Odor: Something special but fungus-like, not farinaceous. Taste slightly fungal, subfarinaceous to pungent.

Microscopic feat.:
  • Basidio/Spores: (5.5-) 6-7 (-8) x 3-4 x 3-3.5 (-4) µm, subellipsoid or subovoid both in face and side view, brownish yellow, thin-walled, with a broad germ pore at one end and an acute short appendage at the other.
  • Basidia: (16-) 17.5-24 x (4-) 5-6 µm, 4-spored, clavate ventricose, hyaline.
  • Pleurocistidia: (16-) 17.5-27 (-28) x (4-) 5-7 (-9) µm, common, hyaline, subfusoid with acute apex or sublageniform with a short neck.
  • Cheilocystidia: (14,5-) 16-28 (-31) x (4-) 5-6,5 µm, abundant, hyaline, ventricose sublageniform, frequently with a middle constriction with a short or long neck, sometimes bifurcate.
  • Subhymenium: Not well differentiated.
  • Trama: of gill regular, formed by hyaline to pale yellow hyphae, thin-walled 2.5-13 µm wide.
  • Epicutis: Subgelatinized, formed by 2.5-4 µm hyaline to pale yellow parallel hyphae.
  • Hypodermium: With hyaline or pale yellow hyphae or subglobose elements 5-17 µm, wide, thin to thick-walled. Clamp connections present.

Habitat: Gregarious on soil, in a subtropical forest ("bosque ombrofilo montano siempre verde") with Cyathea and Blechnum at 2400 m of elevation. Known only from the type locality.

Studied material: VENEZUELA:: Márida State, Parque Sierra Nevada, Telefárico de Márida, La Montana Station, May 23, 1993, Marcano & Guzmán s.n. (Guzmán 30806), (Holotype Herb. Univ. de Los Andes, Fac. Farmacia 8001; izotyp XAL).

Discussion: The presence of an annulus relates this species to Psilocybe argentipes Yokoyama from Japan and Psilocybe graveolens Peck from U.S., but the former has no pleurocystidia and the latter has broader spores [4.5-5(-6) µm] and hyaline to brownish pleurocystidia. Its habit is similar to that of Psilocybe zapotecorum and Psilocybe angustipleurocystidiata, but those species have no annulus, and the pleurocystidia are vesiculose submucronate or subfusiform, 5.5-14 µm wide in the former, and 3-6.5 µm wide in the latter. The strong blue-green to blackish or black reaction in all parts of the basidiome, including the gills, as well as the pungent taste, are two conspicuous features of Psilocybe meridensis.

source - Bibliotheca Mycologica [159: 103-105]

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