Striatiguttula nypae

Striatiguttula nypae

S.N. Zhang, K.D. Hyde & J.K. Liu MycoKeys 49: 112 (2019)

Classification: Ascomycota-Pezizomycotina-Dothideomycetes-Pleosporomycetidae-Pleosporales-Striatiguttulaceae-Striatiguttula

Host species: Nypa fruticans

Holotype: MFLU 18-1576

Known distribution: Ranong and Krabi Province, Thailand

IF Number: IF828274      Mycobank Number: 828274      FOF Number: FoF05034

Description

Saprobic on mangrove palm Nypa fruticans. Sexual morph: Stromata in vertical section 240–380 µm high, 195–385 µm diameter, (x̅ = 318.2 × 289.0 µm, n = 15), black, scattered, gregarious, immersed beneath host epidermis, and erumpent to superficial, with a papilla or short to long neck up to 550 µm, subglobose or conical, uni-loculate or bi-loculate, coriaceous to carbonaceous, ostiolate, periphysate, papillate and clypeate, glabrous or somewhat interwoven pale brown hyphae or with setae, lying at apex of the neck. Peridium 9–16 µm thin, composed of several pale brown to hyaline angular cells, compressed and pallid inwardly. Wall of the clypeus composed of brown cells of textura epidermoidea and dark brown host tissue. Wall of the neck with thicker and elongated angular cells. Hamathecium 1–2 µm wide, trabeculate pseudoparaphyses, septate, branched, filamentous, anastomosing, embedded in a gelatinous matrix. Asci 64–145 × 8–17 µm, (x̅ = 106.3 × 13.8 µm, n = 30), 8-spored, bitunicate, fissitunicate, cylindric-clavate, pedicellate, apically rounded, with an ocular chamber. Ascospores 18–26 × 4–6 µm, (x̅ = 22.2 × 5.3 µm, n = 50), hyaline to brown, uniseriate to biseriate or triseriate, fusiform, 1–3-septate, constricted at the central septum, the upper middle cell slightly swollen towards the central septum, straight or slightly curved, striate, guttulate, end cells slightly paler, surrounded by a mucilaginous sheath. Asexual morph: Undetermined.

Culture conditions: Colonies on PDA attaining 15 mm diam. within 21 days at 25 ºC under natural light, velvety, centrally raised, greenish grey or greyish olivaceous, reverse dull green or grey olivaceous, with a margin of translucent, milky white to hyaline mycelia.