Xylariales » Diatrypaceae » Allocryptovalsa

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.

 

 

Allocryptovalsa elaeidis (MFLU 15-1438, holotype) (A) Stromata on host substrate. (B) Close up of stroma. (C) Section of ascoma. (D) Peridium. (E) Ostiolar canal. (F) Paraphyses. (G–J) Asci. (K–P) Ascospores. (Q) Colony on MEA. Bars: A = 500 μm, B, C = 200 μm, D, E = 20 μm, F = 10 μm, G–J = 50 μm, K–P = 5 μm.

 

Reference

Konta, S., Maharachchikumbura, S. S. N., Senanayake, I. C., McKenzie, E. H. C., Jeewon, R., Stadler, M., ... & Eungwanichayapant, P. D. (2020). A new genus Allodiatrype, five new species and a new host record of diatrypaceous fungi from palms (Arecaceae). Mycosphere, 11(1), 239-268.

 

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