Pseudodidymosphaeria
Pseudodidymosphaeria Thambug. & K.D. Hyde, in Thambugala et al., Phytotaxa 231(3): 273 (2015).
Index Fungorum number: IF 550959; Facesoffungi number: FoF 00465, 2 morphological species (Species Fungorum 2022), 2 species with molecular data.
Saprobic on Spartium junceum L. and possibly grasses in terrestrial habitats. Sexual morph: Ascomata scattered, or in small groups, immersed, globose to subglobose, ostiolate. Peridium thin-walled, 1-layered, composed of hyaline to brown compressed cells of textura angularis and textura prismatica, cells towards the inside lighter and somewhat flattened, at the outside, darker, fusing and indistinguishable from the host tissues. Hamathecium of dense, long, branched, septate, cellular pseudoparaphyses, anastomosing mostly above the asci, embedded in mucilage. Asci 8-spored, bitunicate, fissitunicate, cylindro-clavate, pedicellate, rounded at the apex and with an ocular chamber. Ascospores uniseriate to obliquely uniseriate, ellipsoid with broadly obtuse ends, brown to reddish brown, uniseptate, constricted at the septum, verrucose, surrounded by mucilaginous sheath. Asexual morph: Conidiomata solitary or in groups, scattered, globose to subglobose, dark brown to black, semi-immersed on PDA, pulvinate, unilocular. Conidiomatal wall comprising several cell layers; outer layers composed of brown to lightly pigmented cells of textura angularis to globosa, becoming thin-walled and hyaline towards the inner region. Conidiophores reduced to conidiogenous cells. Conidiogenous cells formed from the cells lining the inner walls of the conidiomata, phialidic, fusiform to cylindrical, determinate, hyaline. Conidia solitary, ovoid, straight, oval to ellipsoidal, producing conidia at their tips, smooth, hyaline, aseptate (adapted from Thambugala et al. 2015).
Type species: Pseudodidymosphaeria spartii (Fabre) Thambug., Camporesi & K.D. Hyde
Notes: Pseudodidymosphaeria is characterised by scattered, immersed, globose to subglobose ascomata, peridium with hyaline to brown compressed cells of textura angularis and textura prismatica, fissitunicate, cylindro-clavate, pedicellate asci and brown to reddish brown, uniseptate ascospores. The asexual morph is characterised by globose to subglobose, dark brown to black, semi-immersed conidiomata, fusiform to cylindrical, determinate conidiogenous cells and solitary, ovoid, straight, oval to ellipsoidal conidia. Pseudodidymosphaeria spartii was previously described as Didymosphaeria spartii. In the multi-gene phylogenetic analysis of Thambugala et al. (2015), their newly collected strains of D. spartii (MFLUCC 13–0273 and MFLUCC 14–1212) clustered as a distinct lineage in Massarinaceae with high statistical support hence D. spartii was accommodated in a new genus. Pseudodidymosphaeria is morphologically and phylogenetically a well-defined genus in Massarinaceae. Molecular markers available include LSU, SSU and ITS.
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