Psilocybe guatapensis

Psilocybe guatapensis Guzmán, Saldarriaga, Pineda, Garcí et Velázquez

Macroscopic feat.:
  • Cap/Pileus: 8-12 mm in diameter, acute-campanulate, mamillate, lubricous, glabrous, even to slightly sulcate in the margin, hygrophanous, reddish brown to yellowish brown or yellowish orange.
  • Gills/Lamellae: Subadnate, grayish brownish with violaceous tinges and whitish edges.
  • Stem/Stipe: 25-40 x 2-3 mm, equally, but at base subbulbous, hollow, flexuous, whitish to yellowish brown, covered by white subfloccose scales. Veil arachnoid, white, evanescent, leaving small appendages at the pileus margin.
  • Context: Whitish in the pileus, pale brownish in the stipe. Readily turning blue green when injured.
  • Odor: And taste farinaceous.

Microscopic feat.:
  • Basidio/Spores: (5.5-) 6-6.5 (-7) x 4-5 µm, subrhomboid in face view, subellipsoid in side view, thick-walled, yellowish brown, with a broad germ pore.
  • Basidia: 18-20 x 5-6 µm, 2-, 3 or 4-spored, hyaline, ventricose with a median constriction.
  • Pleurocistidia: Absent.
  • Cheilocystidia: 16-28 x 3-5 µm, abundant, forming an sterile band at the edge of the gill, hyaline, fusoid-ventricose or lageniform with a short or long, simple or bifurcate neck.
  • Epicutis: Subgelatinous with postrated, smooth, hyaline to yellowish brown hyphae.
  • Hypodermium: Hyphodermium with irregular hyphae 5-19 µm in diameter, hyaline or brownish yellow, with incrustations on the walls.
  • Trama: Gill trama with parallel hyphae 4-11 µm broad, hyaline, incrusted with brownish yellow pigment. Clamp connections present.

Habitat: Caespitose and gregarious, in orange brown clay soil covered by mosses, in a road embankment, in a subtropical forest with (Podocarpus), at 1850 m alt. Known only from the type locality.

Studied material: COLOMBIA, Departamento Antioquia, Municipio Guatapé, Finca Montepinar, Sept. 15, 1990, Guzmán 29571-B (holotype HUA, isotype XAL).

Discussion: This species is close to Psilocybe cordispora Heim, known only from Mexico, but differs by the bulbous base of the stipe, the mamillate pileus, and the smaller cheilocystidia [(20-) 25-35 x 5-6 µm in Psilocybe cordispora]. Other allied species is Psilocybe mammillata (Murr.) Smith, which lacks a bulbous stipe and differs also by its cheilocystidia 12-17 µm (Guzmán, 1983). All these fungi, including Psilocybe guatapensis, belong to Sect. Cordispora that have hallucinogenic properties.

source - [51: 228-229]

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