Phragmogibbera
Phragmogibbera Samuels & Rogerson, Mem. N. Y. bot. Gdn 64: 178 (1990).
Index Fungorum number: IF 25543; Facesoffungi number: FoF 12394, 1 morphological species (Species Fungorum 2022), no molecular data available.
Habitat fungicolous on Xylariaceae. Sexual morph: Ascostromata erumpent from ostioles of host Xylaria, turbinate. Ascomata globose, wall black, carbonaceous, non-papillate, ostiolate not sure. Peridium tissue continuous with the stroma, 2-layered. Hamathecium of rare, septate pseudoparaphyses. Asci 8-spored, bitunicate, fissitunicate dehiscence not observed, broadly cylindrical to narrowly clavate, with a conspicuous ocular chamber. Ascospores partially to completely biseriate, narrowly curved, fusoid, end cells colorless and central cells brown, multi-septate, constricted at each septum. Asexual morph: Stigmina-like (Samuels and Rogerson 1990). Cells at upper surface of stroma producing conidiophores. Conidiophores pale brown, septate, sparingly branched, each branch terminating in a single conidium and proliferating percurrently. Conidia cylindrical to narrowly clavate, (1–)2–3 distoseptate, dark brown, smooth, with a torn, circular basal abscission scar (adapted from Zhang et al. 2011).
Type species: Phragmogibbera xylariicola Samuels & Rogerson
Notes: Phragmogibbera is characterised by globose, black wall, carbonaceous, non-papillate ascomata, broadly cylindrical to narrowly clavate asci and narrowly curved, fusoid ascospores. The asexual morph is Stigmina-like, characterised by pale brown, septate conidiophores and cylindrical to narrowly clavate, (1–)2–3 distoseptate, dark brown conidia. Lumbsch and Huhndorf (2010) accepted Phragmogibbera in Venturiaceae. Zhang et al. (2011) examined the isotype of P. xylariicola (NY Gary J. Samuels 1238) and excluded it from Venturiaceae based on the narrowly fusoid, 3-septate ascospores and clavate asci with a furcate pedicel. Hyde et al. (2013) excluded Phragmogibbera from Venturiaceae based on morphology. Kirk et al. (2013) and Wijayawardene et al. (2017, 2020) accepted Phragmogibbera in Venturiaceae. Fresh collections with DNA sequence data are needed to confirm the systematic position of Phragmogibbera.
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