Pleosporales » Aigialaceae » Fissuroma

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.

 

 

Fissuroma wallichiae (MFLU 15-0290, holotype). (A) The forest in Krabi Province. (B) Palm samples (Wallichia Roxb., Arecaceae). (C, D) Appearance of ascomata on host. (E) Vertical cut of ascoma. (F) Vertical section of ascoma. (G) Close-up of ostiole. (H) Sections of peridium. (I–L) Asci and ascospores with pseudoparaphyses. (M) Pseudoparaphyses. (N–S) Ascospores. (T, U) Germinated ascospores. (V) Colony on MEA. bars: B = 3 cm, C–D = 1,000 μm, E = 500 μm, F = 100 μm, G, H, N–T = 20 μm, I–M = 50 μm.

 

Reference

Konta, S; Hyde, KD; Eungwanichayapant, PD; Tennakoon, DS; Bahkali, AH; Elgorban, AM; Boonmee, S. (2020) Fissuroma (Aigialaceae, Pleosporales) appears to be hyperdiverse on Arecaceae; evidence from two new species from southern Thailand. Acta Botanica Brasilica. 34(2):384-393

 

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