Chaetosphaeriales » Linocarpaceae » Linocarpon

Linocarpon arengae

Linocarpon arengae

Konta, Boonmee & K.D. Hyde (2017)

 

Classification:Ascomycota-Pezizomycotina-Sordariomycetes-Sordariomycetidae-Chaetosphaeriales-Linocarpaceae-Linocarpon

 

Host species: Arenga pinnata (Konta et al. 2017)

 

Holotype: MFLU 15–0306 (Konta et al. 2017)

 

Known distribution: Phang-Nga, Thailand

 

IF Number: IF553960     Mycobank Number: 553960     FOF Number: FoF03844

 

Description

Saprobic on rachis of Arenga pinnata (Wurmb) Merr. Sexual morph: Ascomata 125–355 μm high × 878–1,368 μm diameter (x̅  = 205 × 1,094 μm, n = 10), solitary or aggregated, superficial, comprising black, dome-shaped, raised, blistering areas, subglobose, flattened at the base, with a central ostiole. Peridium 64–90 μm diameter (x̅  = 76 μm, n = 10), outer cells merging with the host epidermal cells, composed of dark brown to black cells of textura angularis. Hamathecium comprising numerous, 2–3.5 µm diameter (x̅  = 3 μm, n = 10), hyaline, hypha-like, septate paraphyses, longer than asci. Asci 132–177 × 9–15 μm (x̅  = 153 × 11 μm, n = 20), 8-spored, unitunicate, cylindrical, long-pedicellate, with a J^-, wedge-shaped, subapical ring. Ascospores 91–102 × 2–4 μm (x̅  = 102 × 3 μm, n = 20), parallel when immature, becoming spiral when mature, filiform, straight or curved, hyaline, aseptate, containing numerous refringent septum-like bands, ends rounded, with polar mucilaginous appendage at the apex, smooth-walled. Asexual morph: Undetermined.

 

Culture conditions: Ascospores germinating on MEA within 3 days. Colonies on MEA reaching 6.5–7 cm diameter after 2 months at 25 °C, white at the edge, brown in the middle with strong radiations outwards. After 30 days of incubation, colonies smooth, hyphae septate, branched, smooth.

 

Linocarpon arengae (MFLU 15–0306, holotype). (A) Appearance of ascomata on host substrate. (B, C) Close up of ascoma. (D) Yellowish ascospore mass. (E) Section of ascomata. (F, G) Peridium. (H) Paraphyses. (I–N) asci. (O) J- reaction of apical ring. (P–T) Appendage. (U–AB) Ascospores. Scale bars: B = 500 μm, C–F = 200 μm, G = 20 μm, H = 10 μm, I–N, U–AB = 50 μm, and O–T = 5 μm.

 

Reference

Konta, S., Hongsanan, S., Eungwanichayapant, P. D., Liu, J. K., Jeewon, R., Hyde, K. D., ... & Boonmee, S. (2017). Leptosporella (Leptosporellaceae fam. nov.) and Linocarpon and Neolinocarpon (Linocarpaceae fam. nov.) are accommodated in Chaetosphaeriales. Mycosphere, 8(10), 1943-1974.

 

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