Pleosporales » Astrosphaeriellaceae » Triseptatospora

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.

 

 

Triseptatospora calami (MFLU 15-0280, holotype). (A) Substrate. (B) Appearance of ascostroma on host substrate. (C) Close-up of ascostroma (top view). (D) Close-up of ascostroma (side view). € Vertical section of ascostroma. (F, G) Section of ascostroma. h Peridium. (I–K) Asci. (L) Pseudoparaphyses. (M–Q) Ascospores. (R–T) Germinated ascospores. (U) Colony on MEA. Scale bars: B = 1 mm, C, D = 200 μm, E–G = 100 μm, H–T = 20 μm.

 

Reference

Konta, S; Tibpromma, S; Karunarathna, SC; Samarakoon, MC; Steven, LS; Mapook, A; Boonmee, S; Senwanna, C; Balasuriya, A; Eungwanichayapant, PD; Hyde, KD. (2023) Morphology and multigene phylogeny reveal ten novel taxa in Ascomycota from terrestrial palm substrates (Arecaceae) in Thailand. Mycosphere. 14(1):107–152

 

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