Jeremyomyces
Jeremyomyces Crous & R.K. Schumach., in Crous et al., Fungal Systematics and Evolution 3: 87 (2019).
Index Fungorum number: IF 829307; Facesoffungi number: FoF 08332, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.
Saprobic on host. Sexual morph: Ascomata pseudothecial, intracorticolous, singly, gregarious, unilocular, sphaerical, black; ostiole indistinct. Peridium few layered, consisting of a textura angularis with thick-walled, smooth, and eguttulate cells, inner layers hyaline, outer layers red brown. Paraphysoids numerous, distinctly longer than the asci, basally moniliform, upwards tapered and filiform, end cells gnarled, multi-celled, hyaline, thin-walled, smooth, eguttulate, branched, with anastomoses. Asci 8-spored, clavate, apically rounded with an ocular chamber, pedicel short and furcate, thick-walled, bitunicate, fissitunicate, apical chamber well-defined, clavate to subcylindrical, spores oblique 2-seriate overlapped. Ascospores hyaline, smooth, guttulate, uniseptate (3-septate with age), fusoid, widest above septum, prominently constricted with well-defined mucoid sheath; basal cell somewhat longer and apical cell. Asexual morph: Conidiomata developing in culture, pycnidial, brown, globose with central ostiole. Conidiophores reduced to conidiogenous cells, lining the inner cavity, ampulliform to doliiform, hyaline, smooth, phialidic. Conidia solitary, aseptate, hyaline, smooth, subcylindrical with obtuse ends (adapted from Crous et al. 2019).
Type species: Jeremyomyces labinae Crous & R.K. Schumach.
Notes: Jeremyomyces is characterised by eudothecial, intracorticolous, single, or gregarious, unilocular, spherical ascomata, 8-spored, clavate asci and hyaline, smooth, guttulate, uniseptate (3-septate on maturity) ascospores. The asexual morph is characterised by pycnidial, brown, globose with central ostiole conidiomata, ampulliform to doliiform, hyaline, smooth conidiophores and solitary, aseptate, hyaline, smooth, subcylindrical conidia. Jeremyomyces morphologically resembles Angustimassarina but differs in that the former has a coelomycetous asexual morph. Jeremyomyces is phylogenetically closely related to Acericola but differs in that the latter has distinct brown, three septate ascospores. Crous et al. (2019) suggested that the GenBank sequence of Acericola is wrong. Jeremyomyces is a distinct genus in Phaeosphaeriaceae. Molecular markers of Jeremyomyces available are ITS, LSU, BTUB, Calmodulin, RPB2 and TEF-1.
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