Pleurothyrium
Pleurothyrium Bubák, Ber. dt. bot. Ges. 34: 322 (1916)
Facesoffungi number: FoF 07506
Ascomycota, genera incertae sedis
Saprobic on dead stems of Athyrium filix-femina. Sexual morph: undetermined. Asexual morph: Conidiomata dark brown, stromatic, pycnidial, solitary, subepidermal, immersed, applanate, multilocular, glabrous. Ostiole indistinct, dehiscence by irregular rupture of the apical wall. Conidiomatal wall composed of thick-walled, dark brown cells of textura angularis concentrated in the epidermis in the upper part, becoming hyaline in the lower part, gradually merging pale brown, irregular pseudo-parenchyma between locules. Conidiophores arising from the inner basal wall layer of the locules, hyaline, cylindrical or irregular, branched, septate, smooth-walled. Conidiogenous cells hyaline, holoblastic, cylindrical, integrated, determinate, smooth-walled, terminal or lateral immediately below transverse septa. Conidia hyaline, filiform, attenuated towards each end, truncate at the base, up to 8-septate, smooth-walled (adapted from Sutton 1980).
Type species: Pleurothyrium longissimum (Lib.) Bubák, Ber. dt. bot. Ges. 34: 322 (1916)
Notes: Pleurothyrium resembles Megaloseptoria and Stictosepta in having hyaline, multiseptate conidia. However, Megaloseptoria differs in that the conidiomata are superficial, aggregated in a black stroma, and conidia are large, 30–40-septate (Quaedvlieg et al. 2013). In Stictosepta the conidiogenous cells are holoblastic, sympodial or synchronous, with two small, unthickened, apical conidiogenous loci, whereas in Pleurothyrium the conidiogenous cells are holoblastic, cylindrical, terminal or lateral immediately below transverse septa (Sutton 1980). Pleurothyrium is monotypic and no molecular data is available. Fresh collections are needed to place it in a natural group.
Distribution: Austria (Sutton 1980).
Pleurothyrium longissimum (redrawn from Sutton 1980) a Vertical section of conidioma. b Conidia. c Conidiophores, conidiogenous cells and developing conidia.
References:
Li WJ, McKenZie EHC, Liu JK, Bhat DJ, Dai DQ, Caporesi E, Tian Q, Maharachcikumbura SSN, Luo ZL, Shang QJ, Zhang JF, Tangthirasunun N, Karunarathna SC, Xu JC, Hyde KD (2020) Taxonomy and phylogeny of hyaline-spored coelomycetes. Fungal Diversity 100: pages279–801.
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