Acrocalymma arengae
Acrocalymma arengae
Konta & K.D. Hyde (2023)
Classification:Ascomycota-Pezizomycotina-Dothideomycetes-Pleosporomycetidae-Pleosporales-Acrocalymmaceae-Acrocalymma
Host species: Arenga pinnata (Konta et al. 2023)
Holotype: MFLU 15-0302 (Konta et al. 2023)
Known distribution: Phang-Nga, Thailand
IF Number: IF559674 Mycobank Number: 559674 FOF Number: FoF10819
Description
Saprobic on dead rachis and petioles of Arenga pinnata. Sexual morph: Ascomata 400–500 × 120–170 μm (x̅ = 455 × 150 μm, n = 10), dark brown sometimes covered with light grey, gnarled, warted hairs/setae, gregarious, immersed beneath host epidermis, not upright, laid on the substrate, visible as numerous, raised, dome-shaped areas on the host surface, obpyriform to ampulliform, uni-loculate, rough walls with setae, coriaceous, ostiolate. Ostioles 200–220 × 60–80 μm (x̅ = 215 × 70 μm, n = 10), centrally located, ostiolar canal filled with hyaline periphyses. Peridium 15–30 µm (x̅ = 23 μm, n = 10) wide, composed of dark red-brown to black cells, arranged in textura globulosa to textura angularis. Pseudoparaphyses 1.5–3 µm (x̅ = 2.1 μm, n = 10) wide, numerous, filamentous, branched, septate. Asci 60–190 × 15–30 μm (x̅ = 115 × 20 μm, n = 30), 1–8-spored, bitunicate, cylindrical to clavate, club-shaped pedicellate, apically rounded with an ocular chamber. Ascospores 25–40 × 5–15 μm (x̅ = 30 × 10 μm, n = 30), overlapping 1–2-seriate, hyaline to pale brown, fusiform with acute ends, 1–3-septate, constricted at the septum, rough-walled, surrounded by a thick mucilaginous sheath. Asexual morph: Undetermined.
Culture conditions: Ascospores germinating on MEA within 12 hr. Colonies on MEA from above, brown to greenish-brown at the centre, creamy white until margin; hyaline mycelia at the entire edge; dense, fluffy, and circular; colonies from below, dark-olivaceous brown at the centre, becoming yellowish-brown, and creamy white towards the edge.
Acrocalymma arengae (MFLU 15-0302, holotype). (A) Substrate. (B) Appearance of ascomata on host substrate with and without the outer layer of plant epidermis tissues. (C–E) Close up of ascomata. (F) Section of an ascoma. (G) Peridium. (H) Ostiole. (I) Pseudoparaphyses. (J–R) Asci. (S–AA) Ascospores. (AB) Germinated ascospore. (AC) Colonies on MEA (above reverse view, below upper view). Scale bars: B = 1 mm, C = 500 μm, D, E = 200 μm, F–I, K–AB = 20 μm, j = 50 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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