Amphisphaeriales » Oxydothidaceae » Oxydothis

Oxydothis metroxylonis

Oxydothis metroxylonis

Konta & K.D. Hyde (2016)

 

Classification:Ascomycota-Pezizomycotina-Sordariomycetes-Xylariomycetidae-Xylariales-Oxydothidaceae-Oxydothis

 

Host species: Metroxylon sagu (Konta et al 2016)

 

Holotype: MFLU 15-0029 (Konta et al 2016)

 

Known distribution: Krabi, Thailand

 

IF Number: IF552543      Mycobank Number: 552543      FOF Number: FoF02704

 

Description

Saprobic on petiole of Metroxylon sagu Rottb. (Arecaceae). Sexual morph: Ascomata 716–1,580 μm diam. (x̅ = 1,091 μm diam., n = 40), solitary or aggregated, mostly solitary when young, becoming grouped at maturity, immersed, comprising non-blistering areas, axis oblique or perpendicular to the host surface, with central papilla. Peridium 10–33 μm (x̅ = 21 μm, n = 10), outer cells merging with the host epidermal cells, comprising dark brown to black, cells of textura angularis. Asci 165–181 × 9–15 μm (x̅ = 175 × 14 μm, n = 10), 8-spored, unitunicate, cylindrical-clavate, pedicellate, with a J+, wedge-shaped, subapical ring. Ascospores 47–57 × 4–6 μm (x̅ = 52 × 5 μm, n = 20), 2–3-seriate, fusiform, tapering gradually from the center to the ends, centrally 1-septate, not constricted at the septum, with pointed ends, hyaline, with large multi-guttules in each cell, smooth-walled. Asexual morph: Undetermined. Appressoria 14–31 μm high × 6–17 μm diam. (x̅ = 25 × 10 μm, n = 10) solitary, single, hyaline to light green, irregular in shape, thick-walled.

 

Culture conditions: Ascospores germinating on MEA within 24 hours and germ tubes developing appressoria. Colonies on MEA, olivaceous, rough, producing rudimentary ascomata at the center, slightly fluffy at the margins, hyphae, septate, branched, smooth-walled.

 

 

Oxydothis metroxylonis (holotype) (A) Ascomata on host substrate. (B–C) Section of ascomata. (D) Peridium. (E–G) Asci. (H) J+ reaction of apical ring in Melzer’s reagent. (I–N) Ascospores. (O–Q) Germinating spores. (R–W) Appressoria. Scale bars: A = 1 mm, B–G = 50 μm, H = 20 μm, O–Q = 10 μm, R–W = 5 μm.

 

Reference

Konta, S., Hongsanan, S., Tibpromma, S., Thongbai, B., Maharachchikumbura, S. S. N., Bahkali, A. H., ... & Boonmee, S. (2016). An advance in the endophyte story: Oxydothidaceae fam. nov. with six new species of Oxydothis. Mycosp, 7(9), 1425-1446.

 

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