Triseptatospora calami

Triseptatospora calami

Konta & K.D. Hyde (2023)

Classification:Ascomycota-Pezizomycotina-Dothideomycetes-Pleosporomycetidae-Pleosporales- Astrosphaeriellaceae-Triseptatospora

Host species: Calamus sp. (Konta et al. 2023)

Holotype: MFLU 15-0280 (Konta et al. 2023)

Known distribution: Phang-Nga, Thailand

IF Number: IF559677     Mycobank Number: 559677    FOF Number: FoF10822

Description

Saprobic on dead petioles of Calamus sp. Sexual morph: Ascostromata superficial, visible as numerous, raised, black dome-shaped on host surface, superficial, solitary to gregarious, coriaceous. Ascomata (55–)80–165(–225) × 110–195(–340) μm (x̅ = 97 × 165 µm, n = 20), sub-globose to lenticular or quadrilateral to dome-shaped, clustered, black, ostiolate. Peridium 20–90 μm (x̅ = 36 µm, n = 20) wide, thick-walled, hyaline to dark brown, composed of several layers of cells of textura angularis to textura prismatica. Pseudoparaphyses 1.5–4.5 μm (x̅ = 2.3 µm, n = 20) wide, hyaline, numerous, filiform, trabeculate. Asci 60–105 × 15–30 µm (x̅ = 84 × 24 µm, n = 30), 6–8-spored, bitunicate, broadly clavate, apically rounded with an ocular chamber, short pedicellate. Ascospores 30–40 × 5–15 µm (x̅ = 35 × 10 µm, n = 30), 2–3-seriate, fusiform, 3-septate, hyaline, constricted at the septum, enlarged at the second cell, surrounded by a thin mucilaginous sheath. Asexual morph: Undetermined.

Culture conditions: Colony on MEA. Colonies from above; olivaceous with mycelium medium dense, circular, fluffy at the middle, turning red-brown, towards grey-brown, wrinkled at the margin with lobate edge. Colonies from below; dark brown with an entire edge, producing red-brown to dark-brown pigmentation of medium.