Dinemasporium morbidum Crous, in Crous, Verkley, Christensen, Castañeda-Ruíz & Groenewald, Persoonia 28: 131 (2012)
Saprobic on dead stems of Lolium sp. Sexual morph: undetermined. Asexual morph: Conidiomata 200–300 µm diam., 150–300 µm high, dark brown to black, solitary to gregarious, initially closed, becoming wide open at maturity, cupulate, superficial, unilocular, crateriform in section view, setose. Conidiomatal wall 20–60 μm wide, composed of a basal stroma of textura angularis with thick-walled, pale brown to hyaline cells; and a well-developed excipulum of textura porrecta with dark brown to hyaline cells. Conidiomatal setae 250–500 × 7–10 μm, subulate, broad and dark brown at the base, becoming pale brown, and narrowed towards apex, unbranched, smooth-walled. Conidiophores hyaline, cylindrical to subcylindrical, branched at the base, septate, arising from the innermost cells of the basal stroma and the elements of the excipulum. Conidiogenous cells 6–10 × 1–2 µm, hyaline, phialidic, subcylindrical, discrete, rarely integrated, determinate, smooth-walled. Conidia 9–12 × 2–3 µm ( = 11 × 2.5 µm; n = 30), hyaline, naviculate to fusiform or ellipsoid, with obtuse apex and base, unicellular, smooth-walled, guttulate, bearing a single, unbranched, tubular appendage at each end, 4–9 (= 6.5) µm long.
Material examined: Italy, Province of Perugia, near Niccone, on dead aerialstems of Lolium sp. (Poaceae), 6 November 2012, Erio Camporesi, IT884 (MFLU 19-2884), living culture MFLUCC 13-0401 = KUMCC 15-0622, (KUN, HKAS 101670 ).
Notes: Strain (MFLUCC 13-0401) shares similar morphology of conidiomata, conidiogenous cells, conidia and conidial dimension with D. morbidum [(10–)12–14(–15) × (2.5–)3 µm]. Phylogenetically, this strain shows close affinity with D. morbidum. Based on both morphology and phylogeny, this strain is regarded as conspecific with D. morbidum.
Dinemasporium morbidum (MFLU 19-2884) a Herbarium specimen b, c Appearance of black conidiomata on the host. d Squashed conidioma with setae. e Vertical section of conidioma. f Tissue details of basal stroma and excipulum. g–i Conidiophores, conidiogenous cells and developing conidia. j–k Conidia. l Germinated conidium. m–n Cultures on PDA. Scale bars b–c = 100 µm, d = 200 µm, e = 100 µm, f = 20 µm, g–l = 5 µm, m–n = 20 mm.
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.