Murilentithecium
Murilentithecium Wanas., Camporesi, E.B.G. Jones & K.D. Hyde, in Wanasinghe et al., Cryptog. Mycol. 35(4): 330 (2014).
Index Fungorum number: IF 550728; Facesoffungi number: FoF 00293, 3 morphological species (Species Fungorum 2022), 3 species with molecular data.
Saprobic on dead herbaceous branches. Sexual morph: Ascomata immersed, slightly erumpent, solitary, scattered, broadly oblong with a flattened base, dark brown to black, coriaceous, ostiolate. Ostiole papillate, blackish-brown, smooth, with ostiolar canal filled with pigmented cells. Peridium thick, comprising 8−10 layers, thick at the sides and thinner at the base, outer layer heavily pigmented, thick-walled, comprising blackish to dark brown cells of textura angularis, inner layer composed of hyaline, thin-walled cells of textura angularis. Hamathecium comprising numerous, filamentous, branched septate, pseudoparaphyses. Asci 8-spored, bitunicate, fissitunicate, cylindrical to cylindric-clavate, pedicellate, thick-walled at the apex, with a minute ocular chamber. Ascospores overlapping 1−2-seriate, muriform, mostly ellipsoidal, upper part wider than the lower part, 5−9 transversely septate, with 4−6 vertical septa, deeply constricted at the middle septum, initially hyaline, becoming yellowish-brown at maturity, smooth-walled, ends lighter, conical and narrowly rounded, surrounded by a thick, hyaline, mucilaginous sheath. Asexual morph: Conidiomata pycnidial, solitary, dark brown, immersed, unilocular, with a papillate ostiole. Pycnidial wall multi-layered, with 3−4 outer layers of brown-walled cells of textura angularis, with inner most layer thin, hyaline. Conidiophores reduced to conidiogenous cells. Conidiogenous cells blastic, phialidic, hyaline, smooth, formed from the inner most layer of pycnidium wall. Conidia oblong, mostly straight, infrequently slightly curved, muriform, with 3−5 transverse septa, with 2−5 longitudinal septa, constricted at the septa, initially hyaline, pale brown to brown at maturity, narrowly rounded at both ends, smooth-walled (Adapted from Wanasinghe et al. 2014).
Type species: Murilentithecium clematidis Wanas., Camporesi, E.B.G. Jones & K.D. Hyde
Notes: Murilentithecium is characterised by having ascospores whose central cells have longitudinal septa, with light end cells, becoming yellowish-brown at maturity, a thick peridium and a short neck. Murilentithecium is the first report of muriform spored taxa in Lentitheciaceae. Molecular markers available for Murilentithecium include LSU, SSU, ITS, TEF-1 and RPB2.
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