Amphisphaeriales » Oxydothidaceae » Oxydothis

Oxydothis calamicola

Oxydothis calamicola

Konta & K.D. Hyde (2016)

 

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

 

Host species: Calamus L. (Konta et al. 2016)

 

Holotype: MFLU 15-0016 (Konta et al. 2016)

 

Known distribution: Chiang Mai, Thailand

 

IF Number: IF552542    Mycobank Number: 552542     FOF Number: FoF02701

 

Description

Saprobic on rachis of Calamus L. (Arecaceae). Sexual morph: Ascomata 280–835 μm diam. (x̅ = 673 μm diam., n = 40, up to 1,700 μm), solitary or aggregated, mostly solitary when young, becoming grouped at maturity, immersed, comprising non-blistering areas through the host tissue, axis oblique or perpendicular to the host surface, with central papilla, 30–46 μm high × 186–230 μm diam. (x̅ = 35 × 222 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 8–15 μm (x̅ = 11 μm, n = 10), outer cells merging with the host epidermal cells, comprising dark brown to black, walled cells of textura angularis. Asci 142–150 × 8–11 μm (x̅ = 144 × 10 μm, n = 10), 8-spored, unitunicate, cylindrical, pedicellate, with a J+, wedge-shaped, subapical ring. Ascospores 48–50 × 4–5 μm (x̅ = 48 × 5 μm, n = 20), 1–2-seriate, fusiform, tapering gradually from the center to the ends, centrally 1-septate, not constricted at the septum, with pointed ends, hyaline, with one large guttules at the central when immature, becoming two large guttules when mature in each cell, smooth-walled. Asexual morph: Undetermined. Appressoria not formed.

 

Culture conditions: Ascospores germinating on MEA within 24 hours. Colonies on MEA, grey to olivaceous, surface rough, margins smooth, produced rudimentary ascomata, hyphae, septate, branched, smooth-walled.

 

 

Oxydothis calamicola (holotype) (A) Appearance of fruiting bodies on host substrate. (B–C) Close up of fruiting bodies. (D) Section of ascoma. (E) Peridium. (F–K) Asci. (L) J+ reaction of apical ring in Melzer’s reagent. (M) Germinating ascospore. (N–S) Ascospores. Scale bars: A = 500 μm, B–C = 200 μm, D = 50 μm, E–L = 20 μm, M–S = 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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