Psilocybe zapotecocaribaea

Psilocybe zapotecocaribaea Guzmán, Ramírez-Guillén & T. J. Baroni

Macroscopic feat.:
  • Cap/Pileus: 5-20 mm diam, convex to umbonate or campanulate-mammillate, smooth, dry, margin translucent-striate, some undulating when mature, surface dull Burn Umber to Raw Umber, with a Chestnut umbo, hygrophanous, drying to Rufous, Tawny or Clay, in dry specimens pale or dark cinnamon brown, with a darker umbo.
  • Gills/Lamellae: Adnexed to slightly free, light brown or Clay, edge even, concolorous, in dry specimens the lamellae are Dark Violaceous Brown with whitish edges.
  • Stem/Stipe: 15-65 x 1.5-7 mm, equal to flared or tapered at base, Clay, light brown or dull Raw Umber, covered by whitish floccose scales, sooth or fibrillose, staining blue when handled, in dry specimens becoming reddish-brown, with blackish or dark reddish-brown spots.
  • Odor: Of radish. Taste fungoid.

Microscopic feat.:
  • Basidio/Spores: (5-) 5.5-6.5 (-7) x 3.5-4 x 3-3.5 µm (Q = 1.60), subellipsoid, both in face and side view, thin-walled, yellowish-brown, with a narrow germ pore.
  • Basidia: (13-) 14.5-17.5 x 5-5.5 µm, 4-sterigmate, hyaline, ventricose, with a median constriction.
  • Pleurocistidia: (11-) 12-16 (-17.5) x (3.5-) 4-5.5 µm, uncommon, hyaline, subventricose or subfusoid, with a short or long narrow neck.
  • Cheilocystidia: (12-) 14-36 (-40) x (4-) 5-7.5 (-9) µm, hyaline, subventricose or sublageniform, with an acute apex or a short or long neck, frequently irregularly branched, or some irregularly globose.
  • Subhymenium: Subcellular, with elements 2.5-7 µm wide, thin-walled, with encrusting pale brownish pigment.
  • Trama: Hymenophoral trama regular, hyaline to yellowish, cylindrical or ore frequently subglobose hyphae, 2-20 µm diam, thin- to thick-walled, walls up to 1.5 µm thick.
  • Epicutis: Poorly developed, with a subgelatinized layer of hyaline to yellowish, repent cylindrical hyphae, 1.5-4 µm wide.
  • Hypodermium: With subglobose, hyaline elements 2.5-18 (-20) µm, diam. thin-walled, with a pale brown encrusting pigment. Context with cylindric to inflated elements 2-20 µm wide hyaline to pale yellowish. Clamp connections common.

Habitat: MARTINIQUE, Lorrain River, 100 m altitude, 1 Jun 1975, Fiard 318 (holotype K(M) 84366, as Psilocybe yungensis by Pegler).

Discussion: Psilocybe zapotecocaribaea belongs to section Zapotecorum because of the subellipsoid, thin-walled spores and bluing stipe tissues of the basidiomata. This collection originally was studied and considered by Peglera (1983) as Psilocybe yungensis Singer & A.H. Smith. However Psilocybe yungensis has distinctly rhomboid or subrhomboid, thick-walled basidiospores and belongs in section Cordisporae.
Psilocybe zapotecocaribea is somewhat similar to Psilocybe zapotecoantillarum but differs by the cheilocystidia that are not branched and rarely lageniform in Psilocybe zapotecoantillarum. Psilocybe zapotecocaribaea also has white floccose scales covering the stipe, which are lacking in Psilocybe zapotecoantillarum.
Psilocybe zapotecocaribaea also should be compared to Psilocybe ramulosum (Guzmán & Gononi) Guzmán. Psilocybe ramulosum differs from Psilocybe zapotecocaribaea in highly branched cheilocystidia and pleurocystidia that are longer than found in Psilocybe zapotecaribaea (15-35 (-45) µm long; Guzmán 1995).

source - [95 (6): 1176-1178]

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