Pleosporales » Occultibambusaceae

Seriascoma

Seriascoma Phook., D.Q. Dai & K.D. Hyde, in Dai et al., Fungal Diversity: 10.1007/s13225-016-0367-8, [30] (2016).

 Index Fungorum number: IF 552014; Facesoffungi number: FoF 01978, 2 morphological species (Species Fungorum 2022), 2 species with molecular data.

Saprobic on decaying or submerged bamboo culms. Sexual morph: Ascostromata gregarious, immersed beneath clypeus, coriaceous, uni- to multi-loculate, ostiolate, with slit-like opening. Locules arranged in rows, immersed, subglobose to ampulliform, or quadrilateral, with ostiolate papilla. Peridium thick-walled, composed of several layers of small, dark brown, pseudoparenchymatous cells of textura angularis. Pseudoparaphyses numerous, cellular, hypha-like, broadly filamentous, hyaline, septate. Asci 8-spored, bitunicate, fissitunicate, clavate, long pedicellate, apically rounded, with a well-developed, ocular chamber. Ascospores uni- to tri-seriate, clavate to fusiform, hyaline, septate (Dai et al. 2017). Asexual morph: Coelomycetous. Conidiomata eustromatic, solitary to gregarious, immersed, conical, uniloculate, black. Peridium comprising host and fungal tissue, with several layers of dark brown to black, pseudoparenchymatous cells of textura angularis. Conidiophores reduced. Conidiogenous cells phialidic, determinate, discrete, cylindrical to ampulliform or lageniform, hyaline. Conidia oblong, hyaline, aseptate (adapted from Dai et al. 2017).

Type species: Seriascoma didymosporum Phook., D.Q. Dai, Karun. & K.D. Hyde

Notes: Seriascoma is characterised by elongate, multiloculate ascostromata with a slit-like opening, which differs from the uniloculate ascostromata with a central papilla of Occultibambusa. The asexual morph of Seriascoma is produced on water agar with oblong, hyaline, aseptate conidia, resembling those of Occultibambusa fusispora (Dai et al. 2017). Rathnayaka et al. (2019) introduced the second species in Seriascoma. Seriascoma is a distinct and well-resolved genus in Occultibambusaceae with high bootstrap support (Dai et al. 2017, Tibpromma et al. 2018). Molecular markers available for Occultibambusa are ITS, LSU, SSU, RPB2 and TEF-1.

 

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