Three new species of Rhytidhysteron (Dothideomycetes, Ascomycota) from Mexico

Abstract

The genus Rhytidhysteron is characterised by forming navicular to apothecial hysterothecia, exposing the green, yellow, orange, red, vinaceous or black colours of the hymenium which generally releases pigments in the presence of KOH. The exciple is smooth or striated, the asci bitunicate and ascospores have 1–5 transverse septa. To date, twenty-six Rhytidhysteron species have been described from the Tropics. The present study aims to describe three new species in the Neotropics of Mexico based on molecular methods and morphological features. Illustrations and a taxonomic key are provided for all known species of this genus. Rhytidhysteron cozumelense from the Isla Cozumel Biosphere Reserve, R. esperanzae from the Sierra Juárez, Oaxaca and R. mesophilum from the Sierra Madre Oriental, Hidalgo are described as new species. With the present study, the number of species of Rhytidhysteron known from Mexico is now increased to eight.

New Ascomycetes from the Mexican Tropical Montane Cloud Forest

“…For example, Raymundo et al [47] described Marthamyces coronadoae, Raymundo et al [48] described seven species of Hypocreales, Arias et al [49] registered the asexual phases of 355 species, Medel-Ortiz et al [50] found seven new records for the TMCF, and Raymundo et al [41] recorded 10 new species in Mexico. Other studies that recorded new taxa are as follows (in chronological order): Sánchez-Flores et al [51] described Hymenoscyphus herrerae from Puebla and registered six new species in the country; Raymundo et al [43] recorded 17 new species from different TMCF localities; and Cobos-Villagrán et al [52] registered Rhytidhysteron esperanzae and R. mesophila from Oaxaca and Hidalgo, respectively. In Puebla, three studies are relevant: Barbosa-Reséndiz et al [53] described Daldinia rehmii, Raymundo et al [54] recorded Unguiculariopsis ravenelii, and Sánchez-Flores et al [55] described Ionomidotis mesophile.…”