Chaetosphaeriales » Chaetosphaeriaceae » Dinemasporium

Dinemasporium cruciferum

Dinemasporium cruciferum Ellis, Bull. Torrey bot. Club 9: 20 (1882)

≡ Stauronema cruciferum (Ellis) Syd., P. Syd. & E.J. Butler, Annls mycol. 14(3/4): 217 (1916)

 

Saprobic on dead leaves of grasses. Sexual morph: undetermined. Asexual morph: Conidiomata up to 450 µm wide, and 250 µm deep, black, stromatic, cupulate or obconical in surface view, solitary to gregarious, superficial but semi-immersed in origin, setose. Conidiomatal wall composed of two types; a) basal stroma 30–60 µm thick, of textura angularis, cells thick-walled, often pale brown to brown and encrusted in lower layers, becoming paler, smooth and thin-walled only near the conidial hymenium; b) excipulum 20–30 µm thick, of textura prismatica, with thick-walled and dark brown to brown cells in the external layers, thin-walled, hyaline in the inner layers. Conidomatal setae 10–130 × 2–7 µm, honey-brown to dark brown, thick and smooth-walled, arising from the basal stroma and excipulum; those arising from basal stroma subulate or cylindrical, acute or blunt at apices, multiseptate, straight or divergent; those arising from excipular elements incurved over the conidial hymenium, with fewer septa. Conidiophores lining the cavity of the conidioma, hyaline, cylindrical to subcylindrical, septate, branched, smooth-walled, invested in mucus. Conidiogenous cells 9–20 × 2–2.5 µm, hyaline, lageniform to subcylindrical, discrete or integrated, indeterminate, thickened at periclinal collarette zone, smooth-walled. Conidia 7–10 × 2–4 µm ( = 9 × 3 µm; n = 50), hyaline, fusiform to naviculate, with a narrow, truncate base, aseptate, bearing unbranched, attenuated, flexuous appendages; apical and basal appendages 6–16 ( =9) µm long, single; basal appendage excentric; lateral appendages 3–10 ( =6) µm long, 1–3, inserted about 2–3 µm below the apex,

 

Material examined: USA, New Jersey, New Field, on dead leaves of various grasses, June 1881 (FH 01142403, isotype, Ellis & Everhart - North American Fungi #755)

 

Notes: The isotype was in poor condition, thus the description of conidiomata and conidiomatal wall are based on Nag Raj (1993).

 

 

Dinemasporium cruciferum (FH 01142403, isotype). a, b Herbarium specimen. c Appearance of black conidiomata on the host. d Conidioma with setae. e–f Setae. g Conidiomatal wall. h–k Conidiophores, conidiogenous cells and developing conidia. l–o Conidia. Scale bars: c = 100 µm, d = 50 µm, e–f = 20 µm, g–k = 10 µm, l–o = 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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