Pseudomurilentithecium
Pseudomurilentithecium Mapook & K.D. Hyde, in Hyde et al., Fungal Diversity 100: 69 (2020).
Index Fungorum number: IF 556904; Facesoffungi number: FoF 06791, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.
Saprobic on dead aerial stem. Sexual morph: Ascomata immersed, solitary or scattered, coriaceous, subglobose to globose, dark brown to black, ostiolar neck protruding. Peridium 2–3 layers, comprising dark brown cells of textura angularis. Hamathecium with cylindrical, septate, branching pseudoparaphyses. Asci 8-spored, bitunicate, cylindric clavate, straight or slightly curved, apically rounded, pedicellate. Ascospores overlapping, 1–2-seriate, initially hyaline to pale yellow, uniseptate when immature, becoming golden brown to brown at maturity, ellipsoid to broadly fusiform, muriform, 3–7-transversely septate, with 1–2-longitudinal septate, slightly constricted at the central septum, straight or slightly curved, surrounded by hyaline gelatinous sheath observed clearly when mounted in Indian ink. Asexual morph: Unknown (adapted from Hyde et al. 2020).
Type species: Pseudomurilentithecium camporesii Mapook & K.D. Hyde
Notes: Pseudomurilentithecium is characterised by immersed, solitary or scattered ascomata, cylindric clavate, straight or slightly curved asci, and 1–2-seriate, initially hyaline to pale yellow ascospores surrounded by a hyaline gelatinous sheath. Hyde et al. (2020) showed that Pseudomurilentithecium is closely related to Poaceascoma and Setoseptoria in Lentitheciaceae based on a combined analysis of LSU, ITS, SSU, TEF1-α and RPB2 sequence data. Pseudomurilentithecium can be differentiated from Poaceascoma in that the former has ellipsoid to broadly fusiform, muriform ascospores with 3–7 transverse septa, and 1–2 longitudinal septa, while Poaceascoma has hyaline, filiform, multiseptateascospores that are spirally arranged within the ascus (Phookamsak et al. 2015, Hyde et al. 2020). Pseudomurilentithecium is morphologically and phylogenetically a distinct genus in Lentitheciaceae. Molecular markers available for Pseudomurilentithecium are ITS, LSU, SSU and TEF-1.
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