Chaetosphaeriales » Linocarpaceae » Linocarpon

Linocarpon cocois

Linocarpon cocois

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

 

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

 

Host species: Cocos nucifera (Konta et al. 2017)

 

Holotype: MFLU 15–2345 (Konta et al. 2017)

 

Known distribution: Prachaupkhirikan, Thailand

 

IF Number: IF553961     Mycobank Number: 553961       FOF Number: FoF03845

 

Description

Saprobic on rachis of Cocos nucifera L. Sexual morph: Ascomata 73–184 μm high × 400–980 μm diameter (x̅  = 124 × 655 μm, n = 10, up to 1,000 μm), solitary or aggregated, superficial, comprising shiny, black, dome shaped, raised blistering areas, subglobose, flattened at the base, central ostiole. Peridium 60–92 μm diameter (x̅  = 71 μm, n = 10), outer cells merging with the host epidermal cells, composed of dark brown to black, cells of textura angularis. Hamathecium comprising numerous, 0.5–1 µm diameter (x̅  = 0.7 μm, n = 10), hyaline, septate, hypha-like paraphyses, longer than asci. Asci 100–153 μm × 8–15 μm (x̅ =120 × 10 μm, n = 20), 8-spored, unitunicate, cylindrical, long-pedicellate, with a J-, wedge-shaped, subapical ring. Ascospores 69–90 × 3–5 μm (x̅  = 76 × 4 μm, n = 20), parallel when immature, becoming spiral at maturity, filiform-fusiform, straight or curved, hyaline, aseptate when mature, becoming multi-septate when germinating, without refringent septum-like bands, ends rounded, the base wider than apex, smooth-walled, with a mucilaginous appendage at the apex, producing germ tube from each cell. Asexual morph: Undetermined.

 

Culture conditions: Ascospores germinating on MEA within 24 hours. Colonies on MEA reaching 7–8.5 cm diameter after 2 months at 25°C, white at the edge with strong radiations outwards. After 30 days of incubation, colonies smooth, flat, entire edge margin, brown, hyphae septate, branched, smooth.

 

 

Linocarpon cocois (MFLU 15–2345, holotype). (A) Ascomata on host substrate. (B) Close up of ascomata. (C–E) Sections of ascomata. (F) Peridium. (G–I) Asci. (J) J- reaction of apical ring. (K) Appendage. (L) Paraphysoids. (M–R) Ascospores. (S–T) Germinated ascospores. Scale bars: A, B = 500 μm, C, D = 200 μm, E, G–I = 50 μm, J, K = 5 μm, F, L–T = 20 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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