Dinemasporium pingue (Nag Raj) W.J. Li & K.D. Hyde, comb. nov.
≡ Stauronema pingue Nag Raj, Coelomycetous Anamorphs with Appendage-bearing Conidia: 908 (1993)
Saprobic on decaying fragments of culms and leaf blades of an undetermined grass and on leaves of Dactylis hispanica (Poaceae). Sexual morph: undetermined. Asexual morph: Conidiomata 300–600 µm diam., 200–350 µm high, black, stromatic, cupulate, pulvinate in surface view, solitary to gregarious, superficial to semi-immersed, with a thin hypostroma, oval to rounded or irregular in outline, unilocular, setose, covered with a mass of conidia that is glutinous and pale pink when moist, but waxy yellowish brown and crustose when dry. Conidiomatal wall 10–30 μm thick, composed thick-walled, brown to pale brown cells of textura globulosa to textura angularis in the lower layers, thin-walled and paler above; excipulum composed of textura prismatica below, externally cells thick-walled, pale brown to hyaline giving rise to setae above. Conidomatal setae 88–212 ×2–8 μm, pale brown to brown, but paler towards the apex, cylindrical to subulate, septate, thick-walled, minutely rough-walled, arising from the basal stroma as well as from the excipular elements. Conidiophores lining the cavity of the conidiomata, hyaline, sometimes pale brown in the basal part, cylindrical to subcylindrical, broader at base, septate, irregularly branched, smooth-walled, invested in mucus. Conidiogenous cells 7–22 × 1–3 μm = (= 11 × 2 μm), hyaline, lageniform to subcylindrical, discrete or integrated, thickened at periclinal collarette zone, indeterminate, smooth-walled. Conidia 8–12 × 3–5 μm (= 10 × 4 μm), mostly hyaline, but sometimes pale brown at maturity, ellipsoid, with an acute apex and a narrow, truncate base. bearing unbranched, occasionally forked, narrow and attenuated, flexuous appendages at each end; apical appendage single, arising from the apex; basal appendages mostly 3, rarely 4; one centrally located; others excentric.
Material examined: India, Bangalore, Rajajinagar, on decaying fragments ofculms and leaf blades of an undetermined grass, 10 October 1970, T.R. Nag Raj (N17) (DAOM 215301, holotype).
Dinemasporium pingue (DAOM 215301, holotype) a–c Herbarium specimen. d–g Appearance of black conidiomata on the host. h, l Setae. i–k Vertical sections of conidiomata. m–o Conidiophores, conidiogenous cells and developing conidia. p Basal wall structure. q–s Conidia. Scale bars: d = 500 µm, e–g = 200 µm, h, l = 20 µm, i–k = 100 µm, m–o = 10 µm, p = 50 µm, q–s = 10 µm.
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.