Acrocordia A. Massal., Geneac. lich. (Verona): 17 (1854).
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 is characterised by ecorticate, white thalli, erumpent to sessile, black, carbonaceous, ostiolate ascomata, fissitunicate, cylindrical, short pedicellate asci, and ellipsoid-oval to rarely oblong, hyaline, uniseptate ascospores. The asexual morph is characterised by rare occurrence of pycnidia, microconidia, and 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 having a lichenized lifestyle. Acrocordia differs from Anisomeridium in having broad ocular chamber of the asci, while Anisomeridium has narrow ocular chamber. Acrocordia differs from Monoblastia in having uniseptate 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. For synonyms see Species Fungorum (2023).