Murinectria M. Niranjan & V.V. Sarma, in Hyde et al., Mycosphere 11(1): 738 (2020)
Hypocreomycetidae, Hypocreales, Nectriaceae, Murinectria
Index Fungorum number: IF556843; Facesoffungi number: FoF 06587; 4 morphological species; 4 species with sequence data.
Saprobic on woody hosts. Sexual morph: Stromata immersed to erumpent, subiculate, solitary to aggregated, bright red. Ascomata perithecial, superficial, globose, gregarious, immersed in the stroma, KOH+ve pigments, often associated with synnemata of the asexual state. Peridium consists of cells of textura globulosa and textura angularis, walls pigmented. Asci unitunicate, 8-spored, cylindric-clavate, with or without an inconspicuous ring at apex, early deliquescent. Ascospores overlapping biseriate, hyaline to pale brown, yellow in Lugol's solution, ellipsoidal to fusiform, muriform, often constricted at each septum, straight or slightly curved. Asexual morph: Synnematous on natural substrata, laterally oriented near perithecial ascomata, usually erumpent through epidermis, solitary to gregarious around ascomata, erect or nodding, red-brown at base, becoming dark brown to black with age, Conidiogenous cells phialidic. Conidia hyaline, obovoid, slightly flat to rounded apex, narrow towards base, acute or obtuse ends.
Type species: Murinectria murispora M. Niranjan & V.V. Sarma, in Hyde et al., Mycosphere 11(1): 738 (2020)
Notes: Murinectria is characterized by muriform ascospores, which are similar to some muriform species in Nectria. In the phylogenetic analysis based on ITS and LSU sequence data, conducted by Hyde et al. (2020), a new taxon collected on decaying twigs in Andaman Islands, India, branched separately from other species of Nectria but clustered closely with three Nectria species with muriform ascospores, namely, N. antarctica, N. polythalama, and N. pseudotrichia. These three species and the new taxon branched separately in the phylogram and were distantly placed from other species of Nectria, such as N. balansiae [Fig. 174 in Hyde et al. (2020)]. Hence, based on the characteristics (muriform ascospores) and the molecular sequence analysis, a new genus Murinectria was introduced with M. murispora as the type species. Nectria antarctica, N. pseudotrichia and N. polythalama which produce muriform ascospores were consequently transferred to Murinectria as M. antarctica, M. pseudotrichia and M. polythalama. Murinectria comprises muriform ascospores in the sexual morph and a synnematous asexual morph with phialospores (Hyde et al. 2020).