Pleosporales » Roussoellaceae

Neoroussoella

Neoroussoella Jian K. Liu, Phookamsak & K.D. Hyde, in Liu et al., Phytotaxa 181(1): 21 (2014).

 Index Fungorum number: IF 550668; Facesoffungi number: FoF 08363, 9 morphological species (Species Fungorum 2022), 9 species with molecular data.

Saprobic on decaying bamboo culms. Sexual morph: Ascostromata immersed under a clypeus or epidermis, raised, visible as black dome-shaped or flattened ovoid areas on host surface, coriaceous, solitary to gregarious, black, centrally ostiolate. Peridium composed of 2–3 layers of light brown to brown, thin-walled cells of textura angularis, with flattened base. Hamathecium comprising numerous, anastomosing, cellular pseudoparaphyses, branching at the apex, often constricted at the septum, embedded in a gelatinous matrix. Asci 8-spored, bitunicate, cylindrical, short to long pedicellate, apically rounded with an ocular chamber. Ascospores uni-2-seriateor overlapping, ellipsoidal to fusiform, 2-celled, constricted at the septum, pale brown to brown or yellowish brown, rough-walled, longitudinally ribbed, surrounded by mucilaginous sheath. Asexual morphs: produced on bamboo pieces on WA cultures after 2 months. Conidiomata superficial to immersed, pycnidium, uni-multiloculate, globose to subglobose or irregular shape, scattered or clustered, solitary or gregarious, indistinctly ostiolate. Pycnidial wall composed of several layers of cells of textura angularis. Conidiophores arising from the basal cavity around conidiomata, unbranched, aseptate. Conidiogenous cells annellidic, unbranched, ampulliform or lageniform or cylindrical or cylindric-clavate, hyaline, aseptate, smooth-walled. Conidia oblong to ellipsoidal, hyaline, aseptate with two guttules, smooth-walled (adapted from Liu et al. 2014).

Type species: Neoroussoella bambusae Phook., J.K. Liu & K.D. Hyde

Notes: Neoroussoella is characterised by a distinct asexual morph producing relatively small hyaline conidia with smooth walls compared to Roussoella. Neoroussoella can be distinguished from similar genera based on DNA sequence data. Molecular markers available for Neoroussoella include ITS, LSU, SSU, RPB2 and TEF-1.

 

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