Amphisphaeriales » Oxydothidaceae » Oxydothis

Oxydothis metroxylonicola

Oxydothis metroxylonicola

Konta & K.D. Hyde (2016)

 

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

 

Host species: Metroxylon sagu (Konta et al 2016)

 

Holotype: MFLU 15-0027 (Konta et al 2016)

 

Known distribution: Krabi, Thailand

 

IF Number: IF552539     Mycobank Number: 552539      FOF Number: FoF02703

 

Description

Saprobic on petiole of Metroxylon sagu Rottb. (Arecaceae). Sexual morph: Ascomata 210–490 μm diam. (x̅ = 337 μm diam., n = 40, up to 700 μm), solitary or aggregated, mostly solitary when young, becoming grouped at maturity, immersed, comprising slightly raised blistering areas through the host tissue, axis oblique or perpendicular to the host surface, with central papilla, 62–110 μm high × 193–310 μm diam. (x̅ = 89 ×263 μm, n = 5), in transverse section, lenticular, globose to subglobose, darker at the central region, light towards the outer darker rim on the host surface. Peridium 15–36 μm (x̅ = 24 μm, n = 10) thick-walled, outer cells merging with the host epidermal cells, dark brown to black, walled cells of textura prismatica. Asci 137–150 × 13–19 μm (x̅ = 143 × 16 μm, n = 10), 8-spored, fasciculate, unitunicate, cylindrical-clavate, pedicellate, with a J+, wedge-shaped, subapical ring. Ascospores 52–58 × 8–9 μm (x̅ = 57 × 8 μm, n = 20), 2-seriate, fusiform, curved, tapering gradually from the center to the ends, centrally 1-septate, swollen at the central of each cell, not constricted at the septum, with pointed ends, hyaline, with large globose multi-guttules in each cell, smooth-walled. Asexual morph: Undetermined. Appressoria 12–23 μm high × 7–12 μm diam. (x̅ = 17 × 10 μm, n = 10), solitary, hyaline to light green, irregular in shape, thick-walled.

 

Culture conditions: Ascospores germinating on MEA within 24 hours and germ tube was produced from end cell with developing appressoria structure. Colonies on MEA, olivaceous, rough on surface, produced ascomata-like, colony growing like double rings, hyphae, septate, branched, smooth.

 

 

Oxydothis metroxylonicola (holotype) (A) Ascomata on host substrate. (B–C) Close up of ascomata. (D) Section of ascoma. (E) Peridium. (F–H) Asci. (I–N) Ascospores. (O) J+ reaction of apical ring in Melzer’s reagent. (P) Germinating ascospore. (Q–V) Appressoria. Scale bars: A–B = 500 μm, C = 200 μm, D = 20 μm, E = 20 μm, F–N = 20 μm, O = 10 μm, P = 20 μm, Q–V = 10 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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