Bimuria
Bimuria D. Hawksw., Chea & Sheridan, N.Z. Jl Bot. 17(3): 267 (1979).
Index Fungorum number: IF 574; Facesoffungi number: FoF 00032, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.
Saprobic on host. Sexual morph: Ascomata arising singly, superficial, globose, subhyaline or dark brown when the spores are mature, ostiolate, without a distinct neck. Peridium composed of 2−3 layers of subhyaline and pseudoparenchymatous cells. Paraphyses (pseudoparaphyses) persistent, branched and anastomosing. Asci bitunicate, broadly clavate, 2(−3) spored. Ascospores accumulating in a black globose mass, broadly ellipsoid, muriform, dark brown but with the end cells subhyaline, minutely verrucose, lacking a gelatinous sheath. Asexual morph: Unknown (adapted from Hawksworth et al. 1979).
Type species: Bimuria novae-zelandiae D. Hawksw., Chea & Sheridan
Notes: Bimuria is characterised by globose, subhyaline ascomata, peridium comprising of 2−3 layers of subhyaline pseudoparenchymatous cells, bitunicate, broadly clavate asci and broadly ellipsoid, muriform ascospores. The taxonomic placement of Bimuria has undergone many changes in recent years. Hawksworth et al. (1979) placed Bimuria in Pleosporaceae based on the shape of the ascomata, ascus type and persistent branching and anastomosing paraphyses. Barr (1987) transferred Bimuria to Phaeosphaeriaceae and Lumbsch and Huhndorf (2007) placed it in Melanommataceae. Schoch et al. (2006, 2009) reported that Bimuria is a member of Montagnulaceae based on multigene phylogenetic analyses of SSU, LSU, RPB2 and TEF1. Ariyawansa et al. (2014) treated Bimuria in Didymosphaeriaceae based on combined analysis of ITS, LSU, SSU and β-tubulin gene sequences and synonymized Montagnulaceae with Didymosphaeriaceae. Wijesinghe et al. (2020) introduced the second species, B. omanensis from Oman based on morphology and phylogenetic analyses. Bimuria is a distinct and well-defined genus in Didymosphaeriaceae. Molecular markers available for Barria are ITS, LSU, SSU, TEF-1 and RPB2.
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