Pleosporales » Phaeosphaeriaceae

Neostagonosporella

Neostagonosporella C.L. Yang, X.L. Xu & K.D. Hyde, in Yang et al., MycoKeys 46: 131 (2019).

            Index Fungorum number: IF 555713; Facesoffungi number: FoF 05490, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.

Parasitic on living to nearly dead stems and branches of bamboo. Sexual morph: Ascostromata coriaceous, visible as raised to superficial on host, gregarious, multi-loculate, ellipsoidal, globose to subglobose or irregular in shape, dark brown to black, glabrous. Locules globose to subglobose, with a centrally located ostiole, lacking periphyses. Peridium multi-layered, of brown to dark brown, pseudoparenchymatous cells of textura angularis. Hamathecium comprising trabeculate, anastomosed pseudoparaphyses. Asci 8-spored, bitunicate, fissitunicate, cylindrical to cylindric-clavate, short pedicellate, apically rounded with an ocular chamber. Ascospores overlapping biseriate, hyaline, cylindrical to fusiform, septate, smooth-walled, surrounded by a distinct mucilaginous sheath. Asexual morph: Coelomycetous. Conidiostromata pycindial, coriaceous, superficial, dark brown to black, fusiform to long fusiform or rhomboid, multi-loculate, solitary, glabrous. Pycnidia globose to subglobose, ostiolate. Pycnidial wall comprising multi-layered, of dark brown to black, pseudoparenchymatous cells of textura angularis. Conidiophores reduced to conidiogenous cells. Conidiogenous cells ampulliform to subcylindrical, smooth, hyaline, enteroblastic, phialidic, arising from inner layer of pycnidial wall. Macroconidia hyaline, subcylindrical to cylindrical, septate, nearly equidistant between septa, smooth-walled, sometimes surrounded by a mucilaginous sheath when immature. Microconidia hyaline, varied in shape, aseptate, smooth-walled, with small guttulate (adapted from Yang et al. 2019).

 Type species: Neostagonosporella sichuanensis C.L. Yang, X.L. Xu & K.D. Hyde

Notes: Neostagonosporella is characterised by coriaceous, gregarious, multi-loculate ascomata, cylindrical to cylindric-clavate asci, and hyaline, cylindrical to fusiform, septate, smooth-walled ascospores. Neostagonosporella resembles Stagonospora in having uniloculate conidiomata, a thick pycnidial wall, doliiform, holoblastic conidiogenous cells with numerous percurrent proliferations at the apex and smooth to verruculose conidia (Quaedvlieg et al. 2013, Hyde et al. 2016). Neostagonosporella is closely related to Setophoma and Edenia within Phaeosphaeriaceae. The ideal molecular markers to differentiate species of Neostagonosporella is ITS and TEF 1-α sequence data. Neostagonosporella is a distinct and clearly defined genus in Phaeosphaeriaceae. Molecular markers available for Neostagonosporella are ITS, LSU, SSU, RPB2 and TEF-1.

 

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