Fissuroma palmae

Fissuroma palmae

S.N. Zhang, K.D. Hyde & J.K. Liu Mycosphere 11(1): 279 (2020)

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

Host species: Arenga pinnata

Holotype: MFLU 19-0820

Known distribution: Thailand (Phang-nga Province)

IF Number: IF556950      Mycobank Number: 556950      FOF Number: FoF06862

Description

Saprobic on rachides of palms. Sexual morph: Ascomata 410–760 μm long, 225–490 μm diam. on host surface, in vertical section 150–280 μm high, 380–480 μm diam., black, scattered, rarely clustered, coriaceous, conical, hemisphaerical, unilocular, semi-immersed to erumpent or superficial, form beneath the host surface, base applanate and immersed. Ostioles central, periphysate, with carbonaceous slit-like opening. Peridium 25–60 μm wide, black, thick at sides and thinner at the base, base and corners comprising hyaline to brown fungal cells, which arranged in a textura angularis. Hamathecium up to 1 μm wide, hyaline, filamentous, trabeculate pseudoparaphyses, anastomosing, embedded in a gelatinous matrix. Asci 97–157 × 14–24 μm (x̅ = 121.5 × 19.4 μm, n = 30), 8-spored, bitunicate, cylindric-clavate, short pedicellate, apically rounded with an ocular chamber. Ascospores 40–52 × 6–10 μm (x̅ = 45.3 × 8.4 μm, n = 30), overlapping, 2-seriate, hyaline, becoming brown when mature or senescent, fusiform with acute ends, 1-septate, slightly constricted at the septum, smooth-walled, surrounded by a mucilaginous sheath. Sheath drawn out 2.8–6.4 μm long, 3.5–6.5 μm wide at both ends, up to 5.4 μm at the middle. Asexual morph: Undetermined.