Chaetosphaeriales » Linocarpaceae » Neolinocarpon

Neolinocarpon rachidis

Neolinocarpon rachidis

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

 

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

 

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

 

Holotype: MFLU 15–0307 (Konta et al. 2017)

 

Known distribution: Phang-Nga, Thailand

 

IF Number: IF553962     Mycobank Number: 553962       FOF Number: FoF03846

 

Description

Saprobic on rachis of Arenga pinnata (Wurmb) Merr. Sexual morph: Ascomata 508–590 μm high × 320–390 μm diameter (x̅  = 557 × 346 μm, n = 10), solitary, deeply immersed, with a central raised, black, globose-subglobose papilla, with a central ostiole. Papilla 157–223 μm high × 127–198 μm diameter at the base (x̅  = 188 × 157 μm, n = 5), black, shiny, with hyaline periphyses. Peridium 34–80 μm wide (x̅  = 55 μm, n = 10), outer cells merging with the host epidermal cells, composed of dark brown to black cells of textura angularis. Hamathecium comprising numerous, 2.5–4 µm diameter (x̅  = 3 μm, n = 10), hypha-like, septate, unbranched, paraphyses, longer than asci. Asci 157–205 × 9–19 μm (x̅  = 180 × 14 μm, n = 20), 8-spored, unitunicate, cylindrical, long-pedicellate, with a wedge-shaped, J-, subapical ring. Ascospores 123–140 × 2–4 μm (x̅  = 133 × 3 μm, n = 20), parallel in ascus, becoming spiral when mature, filiform, straight or curved, hyaline, aseptate, containing numerous refringent septum-like bands, rounded at the apex with appendage, pointed at the base, smooth-walled. Asexual morph: Undetermined.

 

Culture conditions: Ascospores germinating on MEA within 7 days. Colonies on MEA reaching 3–4 cm diameter after two months at 25°C, white at the edge, brown in the middle with strong radiations outwards. After 30 days of incubation, colonies smooth, flat, margin undulate, white to gray in the center, gray-brown at the margin, mycelium becoming dark brown when growing into media, hyphae septate, branched, smooth-walled.

 

 

Neolinocarpon rachidis (MFLU 15–0307, holotype). (A) Appearance of ascomata on host substrate. (B, C) Close up of ascomata. (D) Yellowish ascospore mass. (E) Section of ascoma. (F) Papilla. (G) Peridium. (H) Paraphyses. (I–K) Asci. (L) J- reaction of apical ring. (M–P) Ascospores. (Q) Germinated ascospore. Scale bars: B, D = 500 μm, C = 200 μm, E, I–K = 100 μm, F–G = 20 μm, H = 10 μm, L = 5 μm, M–Q = 50 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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