Fissuroma caryotae

Fissuroma caryotae

Wanas., E.B.G. Jones & K.D. Hyde Mycological Progress 17(5): 579 (2018)

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

Host species: Caryota urens, Calamus sp.

Holotype: MFLU 17-1253

Known distribution: China (Yunnan), Thailand (Chiang Mai)

IF Number: IF554088      Mycobank Number: 554088      FOF Number: FoF03608

Description

Saprobic on rachides of palms. Sexual morph: Ascomata 600–630 μm long, 420–575 μm diam. on host surface, in vertical section 220–270 μm high, 425–560 μm diam., black, gregarious, coriaceous, conical, hemisphaerical, unilocular, semi-immersed to erumpent, beneath the host surface, base applanate and immersed. Ostioles central, periphysate, with carbonaceous slit-like opening. Peridium up to 60 μm wide, black, thick at sides towards the apex, poorly developed at the base, base and corners comprising a mixture of host tissue and brown to hyaline fungal cells, arranged in a textura angularis to textura prismatica. Hamathecium up to 1.5 μm wide, hyaline, filamentous, trabeculate pseudoparaphyses, anastomosing, embedded in a gelatinous matrix. Asci 110–160 × 14–21 μm (x̅ = 139.1 × 17.4 μm, n = 22), 8-spored, bitunicate, cylindric-clavate or obclavate, with short furcate to truncate pedicel, apex narrow and rounded, with an ocular chamber. Ascospores 40–54 × 6–9.5 μm (x̅ = 47.2 × 8 μm, n = 40), overlapping 1–3-seriate at the base, 1-seriate at the apex, hyaline, fusiform with acute ends, 1-septate, constricted at the septum, smooth-walled, surrounded by a distinct thin sheath. Asexual morph: Undetermined.

Culture conditions: Colonies growing well on PDA media and attaining a diameter about 2 cm after 21 days at 25 °C, circular, medium dense, tufted colony center elevated, white grayish mycelium, becoming obverse olive to gray-green, reverse dark green.