Psilocybe caribaea Guzmán, T. J. Baroni & Tapia
Habitat: Gregarious or caespitose on rich organic or sandy soil, mixed with decaying plant debris, in tropical and subtropical forests. Known only from Puerto Rico.
Studied material: PUERTO RICO, Mun. Naguabo, Luquillo Mountains, trail from Río Icacos to Río Prieto Dam, 4 Oct 1999, Laboy (PR-5772) (CFMR). Tradewinds Trail, 25 Jun 1995, Lodge, Barley & Wunderle (PR-2669) (CFMR), Lodge, Barley & Wunderle (PR-2671) (CFMR). Mun. Río Grande, Caribbean National Forest, El Yunque, Caimitillo Trail, 29 Jun 1996, Baroni 7971 (HOLOTYPE CORT; ISOTYPE XAL). Mun. Río Grande, Luquillo Mountains., La Mina Recreation Area, Mount Britton Trail, 23 May 2000, Cantrell & Salgado, ledger Cantrell PR-0022 (PR-6170) (UPRRP). MARTINIQUE, Vallée du Lorrain, Nov 1974, Fiard 87 (K(M): 84377); 4 Jun 1975, Fiard 87C (K(M): 84376). Between Gran Riniere and Anse Ceron, 17 Jan 1982, Fiard 1503 (K(M): 84375).
Discussion: Pegler (1983) considered collections of this species from Martinique to be Psilocybe caerulescens. However, even though Psilocybe caerulescens is a member of section Cordisporae, it lacks pleurocystidia and is easily separated from Psilocybe caribaea, which has abundant pleurocystidia.
Psilocybe caribaea is attractive because of its robust basidiomata, which occur in clusters. Its habit is reminiscent of Psilocybe collybiodes Singer & A.H. Smith, but that species has thin-walled ellipsoid basidiospores (Guzmán, 1983). Psilocybe caribaea is most phenetically similar to Psilocybe subtropicalis Guzmán, known from Mexico and Guatemala (Guzmán 1995). However Psilocybe caribaea can be separated from Psilocybe subtropicalis, because it possesses two types of pleuro- and cheilocystidia (recent observations on the holotype by Guzmána and Tapia).
One specimen, PR-6170, possesses slightly larger basidia 28-37 x 6-7 µm with 1, 2, 3 and 4 sterigmata and slightly longer pleurocystidia (13-) 15-24 (-26) µm. However, the differences observed in this collection appear to be reasonably expected morphological variations for Psilocybe caribaea.
source - www.mycologia.org [95 (6): 1172-1174]
Pictures at www.mushroomobserver.org
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