First person to use this name on MO: Herbert Baker
Name: Psilocybe caeruleoannulata
Author: Singer ex Guzmán
Citation: Mycotaxon 7(2): 235 (1978)
Remarks: No fresh specimens of this species were collected in our study, and the collections studied are not in good condition. The macroscopic description above is based on observations by Rick (1961), who first described the species as Stropharia siccipes P. Karst. var. lugubris Rick (Rick 1939). Guzmán (1978) studied the type and considered it as a synonym of P. caeruleoannulata. This is a bluing species, probably with psychotropic effects, as supported by the chemical analysis performed by Stijve & de Meijer (1993). It belongs to the Section Stuntzae Guzmán and is most closely related to P. uruguayensis Singer ex Guzmán and P. stuntzii Guzmán & Ott, two closest species. Stijve & de Meijer (1993) also suggested that P. caeruleoannulata and P. uruguayensis represent a single South American endemic species. Psilocybe caeruleoannulata has been also reported from the states of Paraná (Stijve & de Meijer 1993) and São Paulo (Pegler 1997).
Pileus 10-50 mm diam., conic to convex, surface subviscid, smooth; brownish with striate margin; context fleshy, pale brownish, probably bluing. Lamellae adnexed, blackish brown, rather close. Stipe 30-40 × 5 mm, central, cylindrical, flexuous, annulate. Veil present as a membranous annulus, bluing.
Basidiospores violaceous brown in mass; 9.5-12 × 6.5-7 μm, subellipsoid in side view and ovoid in frontal view, smooth and thick-walled, germ-pore broad, brownish. Basidia 17.5-21 × 5.5-7 μm, clavate, tetrasporic.
Pleurocystidia absent. Cheilocystidia 15.5-21.5 × 3-6.5 μm, ventricose, with a long neck, subcapitate, thin-walled, sometimes with an oleous incrustation at the apex. Pileipellis an ixocutis, with hyaline to slightly incrusted hyphae. Hymenophoral trama regular. Clamp connections present.
Ecology: Lignicolous, cespitose on rotting woodchips of Araucaria angustifolia or Podocarpus.
Specimens examined: BRAZIL. Rio Grande do Sul: Santa Maria, 1936, Rick 15.234 (PACA 9370, holotype of Stropharia siccipes var. lugubris), Rick 15.237 (PACA 9371), Rick 15.238 (PACA 9372).
Distribution: South America (southern Brazil and Uruguay – Guzmán 1983).
Habitat: On marshy ground or in grasslands outside the forests of Araucaria and Podocarpus, in pasture land, sometimes on dung. Known from Brazil and Uruguay.
BRAZIL, State of Sao Paulo, near Campos de Jardao, March 8, 1971, 1600 m elevation.
Santa Maria, 1936, Rick (type of Stropharia siccipes var. lugubris Rick).
Sao Leopolda, 1934, Rick (as Stropharia inuncta).
Without locality: Rick (Herb. Bresadola as Stropharia luteonitens).
URUGUAY, Maldonado, May 27, 1966, Singer (Holotype).
Discussion: P. caeruleoannulata is close to P. stuntzii Guzman & Ott and P. uruguayensis Sing. ex Guzman, but differs in the shorter cheilocystidia (P. stuntzii has cheilocystidia 22-27.5 um long and P. uruguayensis 24.5 – 32 um.
- Mycotaxon 7
Created: 2010-11-19 11:28:48 CST (-0500) by Herbert Baker
Last modified: 2019-04-09 10:25:24 CDT (-0400) by Herbert Baker
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