Fissuroma wallichiae

Fissuroma wallichiae

Konta & K.D. Hyde (2020)

Classification:Ascomycota-Pezizomycotina-Dothideomycetes-Pleosporomycetidae-Pleosporales-Aigialaceae-Fissuroma

Host species: Wallichia sp. (Konta et al. 2020)

Holotype: MFLU 15-0290 (Konta et al. 2020)

Known distribution: Krabi, Thailand

IF Number: IF557046    Mycobank Number: 557046     FOF Number: FoF06904

Description

Saprobic on dead petioles of Wallichia Roxb. Sexual morph: Ascomata 360–870 μm long, in vertical section 170–330 μm high, 400–650 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 30–95 μm wide sides, 19–75 μm wide at base, dark, dark brown to black, thick-walled, of textura prismatica, poorly developed at the base, thick at sides towards the apex. Hamathecium composed of dense, 1–2.4 μm wide, trabeculate, hyaline, anastomosing at the apex, embedded in a gelatinous matrix, pseudoparaphyses. Asci 105–150 × 16–31 μm (x̅ = 123 × 24 μm, n = 30), 8-spored, bitunicate, fissitunicate, cylindrical to obclavate, shortly pedicellate, narrow and rounded apex, with a small ocular chamber. Ascospores 41–55 × 6–19 μm (x̅ = 48 × 10 μm, n = 30), overlapping, 1–3-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, 1.2–4.1 μm wide (x̅ = 2.5 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 10–20 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 to dark greenish at the center, producing brown pigments in MEA.