Psilocybe zapotecoantillarum Guzmán, T. J. Baroni & Lodge
Habitat: Gregarious on bare or mossy soil, in tropical forests. Known only from Puerto Rico.
Studied material: PUERTO RICO, Mun. Río Grande, Luquillo Mountains, La Mina Recreation Area, Caimitillo Trail, 11 Jun 1997, coll. Baroni, ledger Nieves-Rivera PR-797 (PR-4401, NY); 23 May 2000, Cantrell & Salgado (holotype PR-6167, CFMR, isotype, XAL); Baño de Oro Trail, 7 Oct 2000, Lodge & Pérez (PR-6269, UPRRP, CFMR and XAL).
Discussion: Psilocybe zapotecoantillarum belong to section Zapotecorum because of the caerulescent nature of fresh basidiomata and thin-walled subellipsoid spores. Psilocybe zapotecorum Heim emend Guzmán (Guzmán 1983) differs most noticeably from Psilocybe zapotecoantillarum because of differences in the size and form of the pleurocystidia, which are longer and broader (20-38 x 5.5-14 µm) and of different morphologies (ventricose, fusoid-clavate, submucronate or pyriform). The form of the cheilocystidia in Psilocybe zapotecorum is also quite different (ventricose, fusoid-pyriform, ventricose-rostrate or lageniform) (Guzmán 1983).
Other taxa that should be compared with Psilocybe zapotecoantillarum are Psilocybe angustipleurocystidiata Guzmán and Psilocybe sanctorum Guzmán. These species differ from Psilocybe zapotecoantillarum in the size of the cheilocystidia, (10-) 13-24 x (2.5-) 5-6.5 (-8) µm and 13.5-29 x 6-17 µm, respectively. Psilocybe subzapotecorum Guzmán has two types of pleurocystidia (Guzmán 2000) and Psilocybe barrerae Cifuentes & Guzmán emend Guzmán has broader pleurocystidia, (6-) 7-10 (-12) µm (Guzmán et al 1999, Guzmán 2000). Psilocybe halioconiae Guzmán, Saldarriaga, Pineda, García & Velázquez from Colombia (Guzmán et al 1994) differs in the cheilocystidia, which are only up to 24 µm long and rarely sublageniform, ventricose-fusoid to submoniliform.
source - www.mycologia.org [95 (6): 1175-1176]
Pictures at www.mushroomobserver.org
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