Hypsostromataceae Huhndorf, Mycologia 86: 266 (1994).
MycoBank number: MB 81962; Index Fungorum number: IF 81962; Facesoffungi number: FoF 08253, 2 species.
Saprobic on wood. Sexual morph: Ascomata clustered on a tormentose subiculum, superficial, obpyriform, stalked, pale brown, surface roughened or hairy, with a papillate ostiole. Peridium coriaceous, three-layered of textura angularis cells. Hamathecium comprising numerous, narrow, anastomosing, trabeculate pseudoparaphyses, embedded in a gelatinous matrix. Asci 4–8- spored, bitunicate, numerous, elongate clavate long pedicellate, basal on a columnar structure, apically rounded with an ocular chamber with fluoresces in Calcifluor. Ascospores 2-seriate, oblong to narrowly fusiform, pale brown, 3-septate, disarticulating, smooth-walled, without sheath or appendages. Asexual morph: Recorded as pleurophomopsis-like. Pycnidia obpyriform to ampulliform, roughened tuberculate with white, crust-like exudate, ostiolate, with prominent, broad papilla. Conidiogenous cells phialidic, cylindrical to elongate, hyaline, collarettes minute. Conidia ovoid, minute, hyaline, aseptate, and guttulate.
Type – Hypsostroma Huhndorf
Notes – Hypsostromataceae was introduced by Huhndorf (1994) to accommodate two genera, Hypsostroma Huhndorf and Manglicola. Hypsostromataceae members are characterized in having large superficial ascomata with trabeculate pseudoparaphyses, cylindrical to clavate asci and septate, pale brown to brown ascospores (Huhndorf 1994, Hyde et al. 2013). Initially, Hypsostroma was described by Huhndorf (1992) for one species from the Dominican Republic (H. saxicola Huhndorf) and one from Venezuela (H. caimitalense Huhndorf), but were not placed in a family. Later, Huhndorf (1994) referred both species and Manglicola samuelsii Huhndorf in Hypsostromataceae.
Suetrong et al. (2011a) introduced a new family, Manglicolaceae, to accommodate Manglicola guatemalensis in the Jahnulales, as it did not group in the Pleosporales. Manglicola samuelsii remains unresolved due to lack of molecular data to determine the phylogenetic placement. Therefore, Hypsostromataceae comprises only Hypsostroma and further collections are needed for the expansion of the family.