Thyridium Nitschke, Pyrenomyc. Germ. 1: 110 (1867)
Diaporthomycetidae, Diaporthomycetidae families incertae sedis, Thyridiaceae, Thyridium
Index Fungorum number: IF5465; Facesoffungi number: FoF 02137; 32 morphological species; 1 species with sequence data.
Saprobic or hemibiotrophic in woody substrates. Sexual morph: Stromata immersed or erumpent, formed by interwoven yellowish brownish to black hyphae and cells of the substrate, KOH +. Ascomata perithecial, globose, immersed in stromata, with short or long necks with convergent or separate ostioles. Ostioles periphysate. Paraphyses filamentous, septate. Asci 8-spored, unitunicate, cylindrical to clavate, with a J-, apical ring. Ascospores uniseriate, 1-septate or muriform, ellipsoid or biconoid, symmetric, pale brown to dark brown, with thickened and pigmented septa. Asexual morph: Coelomycetous or hyphomycetous. Conidiomata immersed in stromata, irregular, multilocular and folded inside. Conidiophores emerging from the interior of the cavity, bearing one or more conidiogenous cells. Conidiogenous cells enteroblastic, phialidic, hyaline. Conidia ellipsoidal, aseptate, small, hyaline (adapted from Barr 1990b, Leuchtmann & Müller 1986, Maharachchikumbura et al. 2016b).
Type species: Thyridium vestitum (Fr.) Fuckel, Jb. nassau. Ver. Naturk. 23-24: 195 (1870) [1869-70]
Notes: Thyridium was introduced by Nitschke (1867) to accommodate species with uniseriate, muriform,dark-coloured ascospores, 8-spored asci and filiform paraphyses. Furthermore, species of Thyridium are characterized by KOH+ stromata, cylindrical or clavate asci, and very pale brown to dark brown muriform ascospores (Checa et al. 2013, Maharachchikumbura et al. 2016b). Asexual morphs are coelomycetous or produce holoblastic sympodial conidia from hyphae (Leuchtmann & Müller 1986).
Thyridium lasiacidis (Samuels & Rogerson) Checa, M.N. Blanco & G. Moreno