Dinemasporium pseudostrigosum Crous, in Crous, Verkley, Christensen, Castañeda-Ruíz & Groenewald, Persoonia 28: 134 (2012)
Facesoffungi number: FoF 07316
Saprobic on dead stems of Elymus farctus. Sexual morph: undetermined. Asexual morph: Conidiomata 200–300 µm diam., 200–250 µm high, brown to dark brown, superficial, solitary to gregarious, pulvinate, oval to rounded in outline, cupulate in section view, unilocular, setose. Conidiomatal setae 100–200 × 5–15 µm, subulate, brown and blunt at base, becoming paler and acute towards apex, arising from lateral excipulum and basal stroma. Conidiomatal wall 10–30 µm thick, composed basal stroma of textura angularis with thin-walled, hyaline to pale brown cells, and lateral excipulum of textura porrecta with dark brown to hyaline cells. Conidiophores hyaline, cylindrical, irregularly branched, mostly arising from inner layers of basal stroma, occasionally from lateral excipulum. Conidiogenous cells 10–20 × 1–2.5 µm, hyaline, phialidic, integrated or discrete, determinate, subcylindrical, thick and smooth-walled, with moderate periclinal thickenings in the collarette zone. Conidia 9–15 × 2–3 µm ( = 12 × 2.5 µm; n = 30), hyaline, naviculate to fusiform, rounded at the apex, truncate at the base, unicellular, thick- and smooth-walled, guttulate, bearing 3–9 µm long, unbranched, tubular, apical appendage and excentric basal appendage.
Material examined: Italy, Province of Ravenna, Collinaccia-Castrocaro Terme, on dead aerial stems of Elymus farctus (Poaceae), 28 January 2015, Erio Camporesi, IT2352 (MFLU 15-0588), living culture MFLUCC 15-0130 = KUMCC 15-0616.
Notes: Strain (MFLUCC 15-0130/IT2352) shows similar form of conidiomata, conidiogenous cells and conidia with the type of D. pseudostrigosum, but the type has longer appendages [(11–)13–15(–17) µm] (Crous et al. 2012b). Phylogenetically, this strain clusters to D. pseudostrigosum with high bootstrap support. We conclude that the length of appendage cannot be used as a defining feature at species level in Dinemasporium.
Dinemasporium pseudostrigosum (MFUL 15-0588) a Herbarium specimen. b, c Appearance of brown to dark brown conidiomata on the host. d, f Conidiomatal setae. e Vertical section of conidioma. g–h Conidiogenous cells and developing conidia. i Germinating conidium. j–l Conidia. m–n Culture on PDA. Scale bars: b = 500 µm, c = 200 µm, d = 50 µm, e = 100 µm, f, i = 20 µm, g–h = 10 um, j–l = 5 um, m–n = 20 mm.
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