Pseudopeyronellaea
Pseudopeyronellaea L.W. Hou, L. Cai & Crous, in Hou et al., Stud. Mycol. 96: 339 (2020).
Index Fungorum number: IF 833500; Facesoffungi number: FoF 11528, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.
Associated with leaf spots. Sexual morph: Ascomata pseudothecial, globose, pyriform, superficial, with central papillate ostiole, lacking setae; wall of multi-layered. Pseudoparaphyses absent. Asci bitunicate, narrowly ellipsoid to subcylindrical, 8-spored. Ascospores bi- to triseriate, hyaline, ovate to fusoid, prominently guttulate with mucoid sheath, widest just above septum, ends subobtusely rounded. Asexual morph: Unknown (adapted from Hou et al. 2020).
Type species: Pseudopeyronellaea eucalypti (Crous & M.J. Wingf.) L.W. Hou, L. Cai & Crous
Notes: Pseudopeyronellaea is characterised by pseudothecial, globose, pyriform ascomata, narrowly ellipsoid to subcylindrical, 8-spored asci and hyaline, ovate to fusoid ascospores. Hou et al. (2020) collected Peyronellaea eucalypti from leaves of Eucalyptus pellita (Myrtaceae) and observed the sexual morph in culture. In the phylogenetic analysis of Hou et al. (2020) based on LSU, ITS, RPB2 and BTUB sequences, Peyronellaea eucalypti clustered in a distinct lineage distant from Didymella hence was accommodated in the new genus Pseudopeyronellaea. Pseudopeyronellaea can be differentiated from Didymella in having bi- to triseriate, ovate to fusoid and conspicuously guttulate ascospores with mucoid sheaths, while Didymella has biseriate, ellipsoidal to cymbiform ascospores (Chen et al. 2015). Pseudopeyronellaea is morphologically and phylogenetically a distinct and well-defined genus in Didymellaceae. Molecular markers available for Pseudopeyronellaea are ITS, LSU, BTUB, RPB2 and TEF-1.
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