Chaetosphaeriales » Chaetosphaeriaceae » Dinemasporium

Dinemasporium strigosum

Dinemasporium strigosum (Pers.) Sacc., Michelia 2(7): 281 (1881)

 

 

Saprobic on various grasses or on rabbit dung (Nag Raj 1993). Sexual morph: Ascomata 120–300 µm diam., subepidermal, on leaf sheaths and stems, immersed to semi-immersed, solitary to gregarious, globose to elongated, unilocular, glabrous, thick-walled composed of brown elongate polygonal cells. Asci 68–84 × 4–5 µm, 4–8-spored, unitunicate, cylindrical to subcylindrical, pedicellate, rounded above. Ascospores 9–16 × 3–4 µm, hyaline, uniseriate, rarely sub-biseriate, narrowly elliptical to spindle-shaped or slightly inequilateral, smooth-walled, biguttulate. Paraphyses absent (description from Webster 1955). Asexual morph: Coelomycetous. Conidiomata 300–450 µm diam., 250–300 µm high, dark brown to black, stromatic, solitary to gregarious, cupulate, superficial, unilocular, globose to crateriform in sectional view, setose with a central, white, gloeoid mass of conidia, thick-walled. Conidiomatal wall composed of two types: a) basal stroma 20–40 μm wide, moderately developed, of textura angularis with pale brown to hyaline cells; b) excipulum 10–25 μm wide, of textura porrecta, elements septate, moderately thick- and smooth-walled, dilute brown to hyaline cells. Conidiomatal setae 100–600 × 3–20 μm, dark brown below, brown above, subulate, erect or slightly curved, unbranched, smooth-walled, arising from the excipulum and elements of the basal stroma, often interspersed irregularly through the latter, less conspicuous and sparsely septate when arising from the excipular elements. Conidiophores hyaline, cylindrical to subcylindrical, branched, septate, arising from the innermost cells of the basal stroma and elements of the excipulum. Conidiogenous cells 6–15 × 1–2.5 µm, hyaline, subcylindrical to lageniform with marked periclinal thickenings in the collarette zone, straight or slightly curved, discrete or integrated, indeterminate, smooth-walled. Conidia 7–11 × 1.5–3 µm ( = 8 × 2 µm; n = 30), hyaline, naviculate to fusiform or ellipsoid, obtuse or acute at apex, narrow and truncate at base, unicellular, smooth-walled, guttulate, bearing a single, unbranched, tubular appendage at each end, 5–12 (= 9) µm long.

 

Material examined: India, Bangalore, Lalbagh Gdns., on leaves of Bambusa sp., 3 November 1970, T.R. Nag Raj (DAOM 215548).

 

Notes: We re-examined the type specimen of Brycekendrickia indica and found an additional species on Bambusa sp. A comparison morphology study of this species with previous known Dinemasporium species, showed that it shares similar morphology of conidiomata, conidiogenous cells and conidia with the generic type, D. strigosum [8–10(–11) × 1.5–2 µm ( = 9 × 1.8 µm] (Nag Raj 1993).

 

 

Dinemasporium strigosum (Asexual morph, DAOM 215548) a Herbarium specimen. b–d Appearance of dark brown to black conidiomata on the host. e Conidioma with setae. f–g Vertical section of conidiomata. h, l Setae and surface view of excipulum. i Section of peridium. j–k Conidiophores, conidiogenous cells and developing conidia. m–p Conidia. Scale bars b–g = 200 µm, h = 50 µm, i, l = 20 µm, j–k = 10 µm, m–p = 5 µm.

 

 

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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