Pleosporales » Massarinaceae


Semifissispora Swart, Trans. Br. mycol. Soc. 78(2): 259 (1982).

Index Fungorum number: IF 5000; Facesoffungi number: FoF 06501, 5 morphological species (Species Fungorum, 2022), 4 species with molecular data.

Parasitic on surface of dead leaves. Sexual morph: Ascomata immersed and becoming erumpent at maturity, solitary or gregarious, globose to subglobose. Peridium comprising 2 layers of hyaline to dark brown cells of textura angularis, rounded ostiole at the center of mature ascomata. Hamathecium comprising branched, septate, pseudoparaphyses, anastomosing between and above the asci, embedded in a gelatinous matrix. Asci 8-spored, bitunicate, cylindrical, with short, rounded pedicel, apex rounded with an ocular chamber. Ascospores overlapping, 1−3-seriate, ellipsoid to fusiform, uniseptate, constricted at the middle septum when immature, splitting at the middle of each cell at maturity, hyaline, smooth or slightly rough-walled (Adapted from Boonmee et al. 2017). Asexual morph: On OA forming pale brown sporodochial conidiomata, with slimy conidial masses of hyaline conidia. Conidiophores hyaline, smooth, subcylindrical, branched. Conidiogenous cells terminal and intercalary, hyaline, smooth, subcylindrical, phialidic. Conidia solitary, aseptate, hyaline, smooth, subcylindrical, guttulate, apex obtuse, base truncate (Adapted from Crous et al., 2017).


Type species: Semifissispora fusiformis H.J. Swart


Notes: Semifissispora was introduced by Swart (1982) with S. fusiformis as type species. Semifissispora is characterized by immersed to erumpent ascomata, cylindrical asci and ellipsoid to fusiform, uniseptate hyaline ascospores. Crous et al. (2015) added the new species S. natalis to Semifissispora based on morphology and phylogenetic analyses. In the phylogenetic analyses of Crous et al. (2015), S. natalis formed a distinct lineage in Massarinaceae (Pleosporales). Crous et al. (2017) added Semifissispora tooloomensis as the asexual morph of SemifissisporaSemifissispora is morphologically and phylogenetically a distinct genus in Massarinaceae.


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