Acrocordia A. Massal., Geneac. Lich. (Verona): 17 (1854).
Index Fungorum number: IF 46; Facesoffungi number: FoF 08071, 10 morphological species (Species Fungorum 2022), 1 species with molecular data.
Lichenized on bark or rarely on bryophytes or on limestone, in temperate to tropical montane regions. Thallus ecorticate, white. Photobiont Trentepohlia. Sexual morph: Ascomata scattered or rarely clustered, erumpent to sessile, black, carbonaceous, ostiolate, ostiole apical or lateral. Involucrellum present or reduced, carbonized. Excipulum dense, consisting of compressed hyphae, appearing prosoplectenchymatous in thin, bleached sections, hyaline to brown or brown-black. Hamathecium comprising 0.5–0.7 µm wide paraphyses, hyaline, straight, branched and anastomosing. Asci (2–)8-spored, bitunicate, fissitunicate, cylindrical, short pedicellate, with broad, non-amyloid ocular chamber and fuorescent cap-structures. Ascospores mostly uni-seriate, rarely biseriate, ellipsoid-oval to rarely oblong, hyaline, 1-septate, usually granular ornamented. Asexual morph: Pycnidia rare. Conidia acrogenous, microconidia, aseptate, oblong to ellipsoid to fusiform, small, hyaline. Chemistry: Secondary substances absent (Adapted from Hongsanan et al. 2020b).
Type species: Acrocordia garovaglii A. Massal.
Notes: Acrocordia was introduced by Massalong (1854) with A. garovaglii as type species. Acrocordia is characterized by ecorticate, white thallus, erumpent to sessile, black, carbonaceous, ostiolate ascomata, fissitunicate, cylindrical, short pedicellate asci, ellipsoid-oval to rarely oblong, hyaline, 1-septate ascospores. The asexual morph is characterized by rare occurrence of pycnidia, microconidia, aseptate, oblong to ellipsoid, hyaline conidia. Riedl (1961) treated Acrocordia as a subgenus of Leiophloea in Mycoporaceae and Swinscow (1970) placed Acrocordia as a subgenus of Arthopyrenia. Acrocordia is similar to Anisomeridium and Monoblastia in lifestyle but differs from the first genus in having broad ocular chamber of the asci and from the second genus in having 1-septate ascospores while Monoblastia has aseptate ascospores. Acrocordia is morphologically and phylogenetically a distinct genus in Monoblastiaceae. Molecular markers available for Acrocordia are LSU, SSU, TEF-1 and RPB2.