Allodiatrype arengae

Allodiatrype arengae

Konta, Boonmee & K.D. Hyde (2020)

Classification:Ascomycota-Pezizomycotina-Sordariomycetes-Xylariomycetidae-Xylariales-Diatrypaceae-Allodiatrype

Host species: Arenga pinnata (Konta et al. 2020)

Holotype: MFLU 15-1444 (Konta et al. 2020)

Known distribution: Phang-Nga, Thailand

IF Number: IF556929     Mycobank Number: 556929       FOF Number: FoF05117

Description

Saprobic on petiole of Arenga pinnata (Arecaceae). Sexual morph: Stromata 690–940 μm long, 370–935 μm wide (x̄ = 830 × 700 μm, n = 10), with well-developed interior, solitary, superficial, black, without black stromatic, glabrous, subglobose to irregular, pustulate, 1–5-ascomata, with umbilicate ostioles appearing on the surface of the stroma. Ostiole opening through host bark and appearing as black spots, surrounded with a ring-like structure, composed of an outer layer of dark brown, small, tightly packed, thin parenchymatous cells and an inner layer of yellow, large, loosely packed, parenchymatous cells. Ascomata (excluding necks) 250–400 μm high, 240–400 μm diam. (x̄ = 340 × 300 μm, n = 25), perithecial, immersed in the stroma, globose to subglobose, glabrous, ostioles individual, with a short neck. Ostiolar canal 100–170 μm high, 70–130 μm diam. (x̄ = 130 × 100 μm, n = 20), cylindrical, sulcate, with periphyses. Peridium 12–25 μm wide, (x̄ = 20 μm, n = 40), composed of two sections, outer layer of brown to dark brown, thin-walled cells, arranged in textura angularis, inner layer of hyaline thin-walled cells of textura angularis. Hamathecium composed of 3–7 μm wide (x̄ = 5 μm, n = 40), septate, hyaline paraphyses. Asci (excluding stalks), spore-bearing part (14–)20(−45) × (4–)6–10(−12) μm (x̄ = 30 × 8 μm, n = 80), apically rounded, with J-apical ring, apex-bearing part (1.5–)3–5(−7.5) μm long (x̄ = 4 μm, n = 40), 8-spored, unitunicate, clavate, with long stalks, (28–)34–89(–103) μm long (x̄ = 64 μm, n = 60). Ascospores (6–)7–10(−12) × 2–3 μm (x̄ = 10 × 2 μm, n = 120), overlapping, yellowish to light-brown, ellipsoidal to cylindrical or elongate-allantoid, aseptate, smooth-walled. Asexual morph: Undetermined.

Culture conditions: Ascospores germinated on MEA within 24 hours. Colonies on MEA, white in beginning, dense but thinning towards the edge, margin diffuse, reverse pale yellow in the middle.