Clathrospora Rabenh., Hedwigia 1(18): 116 (1857).
Saprobic on wood and stems. Sexual morph: Ascomata semi-immersed, scattered on putrid host stems and foliage, brown to blackish brown, subglobose or nearly globose, with a central sunken ostiole open via a circular lid, asci and pseudoparaphyses forming at the base of the peridium. Peridium composed of 3–5 layers of brown, relatively thick-walled cells of textura angularis, inner cells flattened, thin-walled and lighter. Hamathecium composed of dense, hyaline, filiform, pseudoparaphyses which are longer than the asci. Asci 8- spored, bitunicate, fissitunicate, thick-walled, cylindrical to clavate, with a short pedicle and shallow ocular chamber. Ascospores biseriate, fusiform 7-transseptate, two or many rows of longitudinal septa, muriform, constricted only at the central septum, dark brown to brown, surrounded by a thin, hyaline mucilaginous sheath. Asexual morph: Alternaria-like (Adapted from Ariyawansa et al., 2014).
Type species: Clathrospora elynae Rabenh.
Notes: Clathrospora was introduced by Rabenhorst (1857) with C. elynae as type species. Clathrospora is characterized by semi-immersed ascomata, cylindrical to clavate asci and fusiform 7-transseptate ascospores surrounded by a thin, hyaline mucilaginous sheath. Shoemaker and Babcock (1992) added nine species to Clathrospora, provided a key to species based on the number of septa and length of ascospores and treated the genus in Diademaceae. In the phylogenetic analysis of Schoch et al. (2009) and Zhang et al. (2012) two putative strains of Clathrospora, C. elynae (CBS 196.54) and C. diplospora (IMI 68086) clustered in Pleosporaceae. Similar results were reported by Ariyawansa et al. (2014). Clathrospora is morphologically and phylogenetically a well-defined genus in Pleosporaceae with high statistical support. Molecular markers available for Clathrospora include LSU and SSU.