Psilocybe inconspicua

Psilocybe inconspicua Guzmán & Horak

Macroscopic feat.:
  • Cap/Pileus: 5-10 mm diam., convex with conical papilla, margin incurved in young carpophores, pale or deep ochre brown or brown, margin estriate, dry, glabrous, membranaceous, without veil remnants.
  • Gills/Lamellae: Broadly adnate to occasionally subdecurrent, very densely crowded, argillaceous, edges white and sometimes conspicuously fimbriate.
  • Stem/Stipe: 20-25 by 0.5-1 mm, cylindrical, fragile, brittle, concolorous with pileus or paler, covered with white fibrils of the veil, base white from mycelium, often with white rhizoids, dry, solid.
  • Context: Context thin, concolorous with pileus.
  • Odor: And taste not distinctive. Spore print brown.

Microscopic feat.:
  • Basidio/Spores: 5.5-6.5 (-7) by (3.5) 4-5 by 3.3-3.8 µm, subrhombic (dorso-ventral) to subelliptical (lateral), yellowish brown (KOH), smooth, thin-walled membrane, germ pore and apiculus distinct.
  • Basidia: 17.5-22 by 5.5-6.5 µm, subpyriform, hyaline, 4-spored.
  • Cheilocystidia: 20-30 by 7-14 µm, broadly fusoid to vesiculose, brownish (KOH), rarely hyaline, membrane thin-walled, forming sterile gill-edge.
  • Pleurocistidia: Absent. Hyphae of subhymenium and trama irregularly encrusted with orange yellow (KOH) pigment.
  • Epicutis: A cutis of subgelatinized, brownish (KOH) parallel hyphae, encrusted with brown (KOH) pigment.
  • Hypodermium: Subcutis of cylindrical, hyaline, pigmentless hyphae. Clamp connections present.

Habitat: Gregarious in small groups on soil among litter in Araucaria cunninghamii. Known from Papua New Guinea only.

Studied material: PAPUA NEW GUINEA, Morobe District, Bulolo, Susu; 15. I. 1973, leg. HORAK (Holotype ZT, 72/751; isotype in ENCB).

Discussion: This small Psilocybe is a very distinct species. Psilocybe inconspicua has no obvious relationships to other taxa of this genus except with some species described by Guzmán (1977) from the tropical forests of Mexico. The brownish cheilocystidia represent the most prominent taxonomic character. Due to its systematic position it is likely that Psilocybe inconspicua is an hallucinogenic fungus.

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