Cytospora calamicola

Cytospora calamicola

Konta & K.D. Hyde (2023)

Classification:Ascomycota-Pezizomycotina-Sordariomycetes-Sordariomycetidae-Diaporthales-Cytosporaceae-Cytospora

Host species: Calamus sp. (Konta et al. 2023)

Holotype: MFLU 15-0262 (Konta et al. 2023)

Known distribution: Phang-Nga, Thailand

IF Number: IF559679     Mycobank Number: 559679     FOF Number: FoF10825

Description

Saprobic on dead petiole of Calamus sp. Sexual morph: Ascomata 260–380 × 185–290 μm, scattered, immersed, eventually with erumpent neck arising through cracks in bark epidermis, uniloculate, globose to sub-globose or irregular, whitish-yellow on the host surface, with long neck. Neck up to 120–250 μm long, central, lined with periphyses. Peridium 13–16 μm wide, comprising an outer layer of yellow to pale-brown, thick-walled cells of textura prismatica and inner layer, hyaline, thin-walled layer of cells. Paraphyses absent. Asci 15–20 × 3–5 μm, (x̅ = 16.5 × 5 μm, n = 50), 8-spored, unitunicate, cylindrical to clavate, with thin-walled pedicel, apex flat. Ascospores 3–5 × 1–2 μm, (x̅ = 4.3 × 1.7 μm, n = 100), biseriate or crowded, hyaline, fusiform or allantoid, oblong, unicellular, aseptate, smooth-walled (Fig. 11.11). Asexual morph: Coelomycetous. Conidiomata 250–300 × 110–175 μm, appearing as brownish-yellow areas, pycnidia semi-immersed, solitary or aggregated, globose to sub-globose, with long neck. Peridium 10–13 μm wide, comprising pale-brown, thick-walled, cells of textura epidermoidea. Conidiophores erect, hyaline. Conidiogenous cells enteroblastic, proliferating percurrently to produce small, hyaline, ellipsoidal conidia. Conidia 1–3 × 1–2 μm, (x̅ = 1.8 × 1.3 μm, n = 20), oblong to fusiform, small, unicellular, hyaline and smooth-walled.

Culture conditions: Colonies on MEA after ascospores and conidia germinated. Colonies from above; white to creamy, mycelia medium dense, circular, flat, entire margin. Colonies from below; yellow-white, circular with entire edge.