Xenoanthostomella calami

Xenoanthostomella calami

Konta & K.D. Hyde (2023)

Classification:Ascomycota-Pezizomycotina-Sordariomycetes-Xylariomycetidae-Xylariales-Gyrotrichaceae-Xenoanthostomella

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

Holotype: MFLU 15-0003 (Konta et al. 2023)

Known distribution: Chiang Mai, Thailand

IF Number: IF559682       Mycobank Number: 559682    FOF Number: FoF10828

Description

Saprobic on dead rachis of Calamus sp. Sexual morph: Ascomata 100–150 × 60–150 μm (x̄ = 125 × 115 μm, n = 20), solitary, immersed, visible as black spots, raised, thick carbonaceous cap, in cross-section ampulliform to ovoid or oppyriform to irregular. Ostioles 45–60 × 60–85 μm (x̄ = 52 × 73 μm, n = 20), central, shiny black, conspicuous, ostiolar canal periphysate. Peridium 5–60 μm (x̄ = 27.5 μm, n = 40) wide, comprising hyaline to brown cells of textura angularis. Paraphyses 1–6 μm (x̄ = 3.6 μm, n = 70) wide, long, cylindrical, septate with small guttules, hyaline, smooth-walled. Asci 50–90 × 10–15 μm (x̄ = 67.5 × 13 μm, n = 30), 6–8-spored, unitunicate, clavate, constricted near the apex, discoid, J+ apical ring in Melzer’s reagent, apex rounded, short pedicellate. Ascospores 10–16 × 4–7 μm (x̄ = 12.4 × 5.3 μm, n = 40), uni- to bi-seriate, hyaline to pale brown when immature, dark olivaceous-brown at maturity, 1–3-large guttules when immature, multi-granule at maturity, oblong to narrowly ellipsoid, inequilateral to broadly fusiform, slightly curved, limoniform, aseptate, thick mucilaginous sheath, with a straight germ slit along the entire spore length. Asexual morph: Undetermined.

Culture conditions: Colonies on MEA after ascospore germinated. Cultures from above; brown, dense, circular, edge undulate or erose or lobate, wrinkled, folded, brown, next circular dark olivaceous-brown, white-creamy at edge. Colonies from below; dark olivaceous-brown at the center, wrinkled, folded, white-creamy at the edge.