Psilocybe subyungensis

Psilocybe subyungensis Guzmán

Psilocybe yungensis Singer & A.H.Sm. (1958)
Psilocybe yungensis var. diconica A.H.Smith (1958)
Psilocybe acutissima Heim (1959)
Psilocybe chiapanensis Guzmán (1995)
Psilocybe isauri Singer (1959)

Macroscopic feat.:
  • Cap/Pileus: about 10 mm diam., conic to subpapillate, smooth but somewhat striate at the margin, subviscid to dry, hygrophanous, reddish brown or brown, fading to yellowish, but staining blue to blackish when injured.
  • Gills/Lamellae: Adnate, violaceous brown, edges concolorous or some whitish and floccose.
  • Stem/Stipe: About 35 x 1 mm, cylindrical, hollow, reddish brown to darker toward the base, appressed silky floccose from white fibrils, principally at the base. Veil rudimentary and fugacious in the adult stage.
  • Context: Brownish, bluing.
  • Odor: And taste unknown.

Microscopic feat.:
  • Basidio/Spores: (4.4-) 5-6 (-7) x (4-) 4.4-5.5 (-6) x 3.3-4 µm, rhomboid in face view, subelliptic in side view, brownish yellow, with thick wall and distinct broad germ pore, with a short basal appendage.
  • Basidia: 10-20 x 4.4-6 µm, four-spored, hyaline, vesiculose-cylindric, with a slight constriction in the middle.
  • Pleurocistidia: 8.8-11 x 3.8-5.5 µm, hyaline, scanty, sublageniform or fusoid-ventricose with short neck, 1-2 µm diam.
  • Cheilocystidia: 16.5-25 x (5.5-) 7.7-12 µm, hyaline, lageniform, fusoid-ventricose, subpyriform, clavate, ventricose with constrictions in the middle, ampullaceus to somewhat irregularly branched, often reminding one of basidia.
  • Subhymenium: Brownish yellow with more or less parallel hyphae, strongly irregularly pigmented on the walls.
  • Trama: Regular, subhyaline or yellowish, with parallel hyphae 7-12 µm, broad, with pigment incrusted on the thick walls, with appear perforated.
  • Epicutis: Subgelatinized, hyaline with elongated hyphae 3-5 µm broad.
  • Hypodermium: Like the subhymenium and trama. Some parts of the epicutis and subhymenium with blue green diffused pigment in KOH. Clamp connections present.

Habitat: Gregarious on very rotten wood inside the forest. Known only from the type locality.

Studied material: VENEZUELA, State of Miranda, SW of Macaro, near El Arado, July 28, 1972. Dumont VE-6363 (Holotype MER, Isotype, NY).

Discussion: Psilocybe subyungensis is close to Psilocybe yungensis, but the pleurocystidia and cheilocystidia separate the former from the latter. It is also close to Psilocybe fuliginosa (Murr.) Smith but according to a study of the type (NY) and Smith's paper (1948), has larger spores, (5.5-) 6-7 (-8) µm, the cheilocystidia are more uniformly lageniform 16-28 (-33) x 4.4-6.6 µm.

source - [7 (2): 249-250]

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