Fissuroma arengae
Fissuroma arengae
Konta & K.D. Hyde (2020)
Classification:Ascomycota-Pezizomycotina-Dothideomycetes-Pleosporomycetidae-Pleosporales-Aigialaceae-Fissuroma
Host species: Arenga pinnata (Konta et al. 2020)
Holotype: MFLU 15-0300 (Konta et al. 2020)
Known distribution: Phang-Nga, Thailand
IF Number: IF557045 Mycobank Number: 557045 FOF Number: FoF06903
Description
Saprobic on dead rachis of Arenga pinnata (Wurmb.) Sexual morph: Ascomata 510–970 μm long, in vertical section 175–350 μm high, 425–870 μm diam., dark brown, coriaceous, solitary, scattered, gregarious, hemispherical, semi-immersed, immersed beneath host epidermis, appearing as raised areas. Ostioles central, apapillate, with carbonaceous, thin, slit-like opening. Peridium 40–76 μm wide sides, 8–23 μm wide at base, dark brown to black, thick-walled, of textura prismatica, poorly developed at the base, thick at sides towards the apex. Hamathecium composed of dense, 1.1–2.7 μm wide, trabeculate, hyaline, anastomosing at the apex, embedded in a gelatinous matrix, pseudoparaphyses. Asci 110–170 × 19–29 μm (x̅ = 133 × 24 μm, n = 30), 8-spored, bitunicate, fissitunicate, cylindrical to obclavate, short pedicellate, narrow and rounded apex, with a small ocular chamber. Ascospores 40–55 × 10–16 μm (x̅ = 48 × 14 μm, n = 30), overlapping, 1–2-seriate, fusiform, hyaline, smooth-walled, tapering to pointed apices, 1-septate, septum nearly median, constricted at the septum, straight to curved, surrounded by a thin distinctive sheath, 1.5–3.8 μm wide (x̅ = 2.6 μm, n = 30), smooth-walled, with two large guttules nearly septum, and two minus guttules toward to ends of ascospores. Asexual morph: Undetermined. Appressoria: not formed.
Culture conditions: Colonies on MEA reaching 20 mm diameter after 2 weeks at 25–30 °C, colonies medium dense, circular, convex, surface slightly rough with edge entire, effuse, velvety to hairy, margin well-defined, colony from above, white to cream at the margin, brown at the center, not producing pigments in culture.