Pleosporales » Aigialaceae » Fissuroma

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.

 

 

Fissuroma arengae (MFLU 15-0300, holotype). (A, B) The forest in Phang-nga Province. (C) Palm samples (Arenga pinnata, Arecaceae). (D) Appearance of ascomata on host. (E) Close-up of ascoma. (F) Vertical cut of ascoma. (G) Vertical section of ascoma. (H) Sections of peridium. (I) Close-up of ostiole. (J–M) Asci and ascospores with pseudoparaphyses. (N) Pseudoparaphyses. (O–R) Ascospores. (S, T) Germinated ascospores. (U) Colony on MEA. bars: D = 1000 μm, E–F = 500 μm, G = 200 μm, H–N = 50 μm, O–T = 20 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

 

Recent Notes

Important News
Updated Log

Recent Genus

Thelotrema
Coniella
Sporoschisma

Recent Species

Hemicorynespora obclavata
Guignardia manokwaria
Caudatispora palmicola