Allocryptovalsa elaeidis

Allocryptovalsa elaeidis

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

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

Host species: Elaeis guineensis (Konta et al. 2020)

Holotype: MFLU 15-1438 (Konta et al. 2020)

Known distribution: Krabi, Thailand

IF Number: IF556570     Mycobank Number: 556570       FOF Number: FoF05116

Description

Saprobic on dead petiole of Elaeis guineensis (Arecaceae). Sexual morph – Stromata (285–)330–730(–950) μm long, (250–)350–890(–1030) μm wide (x̄ = 568 × 600 μm, n = 20), mostly solitary, sometimes gregarious, surrounded by black circle on host surface, immersed to erumpent in the bark, black, raised, pustulate, dome-shaped, 1–2-ascomata, with umbilicate ostiole appearing on the surface of stroma. Ascomata (including neck) 325–460 μm high, 315–515 μm diam. (x̄ = 365 × 400 μm, n = 20), perithecial, immersed in the stroma, covered with the epidermis of plant tissue, delimited by a black zone in host tissues, globose to subglobose, glabrous, ostiole individual, with a short neck. Ostiolar canal 180–250 μm high, 160–230 μm diam. (x̄ = 250 × 230 μm, n = 5), sulcate, with periphyses. Peridium 25–86 μm wide (x̄ = 46 μm, n = 30), composed of two sections, outer layer dark brown, thick-walled cells, arranged in textura angularis, inner layer hyaline, thin-walled cells of textura angularis. Hamathecium composed of 3–13 μm wide (x̄ = 6 μm, n = 40), filiform, septate, hyaline, unbranched, paraphyses. Asci (including stalks) (55–)68–147(−157) × 14–26 μm (x̄ = 97 × 18 μm, n = 30), apex-bearing part (1.7–)2–4(−5.5) μm long (x̄ = 3 μm, n = 30), polysporous, unitunicate, clavate, with moderately short stalks, stalk-bearing part 35–56 μm long (x̄ = 50 μm, n = 10). Ascospores (6–)7.5–9(−10.5) × 2–4 μm (x̄ = 9 × 3 μm, n = 100), overlapping, yellowish to brown, ellipsoidal to cylindrical or elongate-allantoid, aseptate, smooth-walled. Asexual morph – Undetermined.

Culture conditions: Ascospores germinated on Malt Extract Agar (MEA) within 24 hours. Colonies on MEA, dense but thinner towards the edge, margin diffuse, white of upper surface.