Chaetosphaeriales » Leptosporellaceae » Leptosporella

Leptosporella arengae

Leptosporella arengae

Konta & K.D. Hyde (2017)

 

Classification:Ascomycota-Pezizomycotina-Sordariomycetes-Sordariomycetidae-Chaetosphaeriales-Leptosporellaceae-Leptosporella

 

Host species: Arenga pinnata (Konta et al 2017)

 

Holotype: MFLU 15–0305 (Konta et al 2017)

 

Known distribution: Phang-Nga, Thailand

 

IF Number: IF553957      Mycobank Number: 553957      FOF Number: FoF03841

 

Description

Saprobic on rachis of Arenga pinnata (Wurmb) Merr. Sexual morph: Ascomata 582–928 μm diameter × 293–354 μm high ( x̅ = 777 × 333 μm, n = 10), solitary, superficial, comprising black, carbonaceous, dome-shaped, raised blister-like areas, subglobose, flattened at the base, ostiole central. Peridium 78–150 μm diameter ( x̅ = 104 μm, n = 10), outer cells merging with the host epidermal cells, composed of dark brown to black cells of textura angularis. Hamathecium comprising numerous, 1.5–3 µm diameter ( x̅ = 2 μm, n = 10), hyaline, hypha-like, septate paraphyses, longer than asci. Asci 137–190 × 10–14 μm ( x̅ = 160 × 12 μm, n = 20), 8-spored, unitunicate, cylindrical, long-pedicellate, with a J-, wedge-shaped, subapical ring. Ascospores 108–132 × 2–3.5 μm ( x̅ = 122 × 3 μm, n = 20), fasciculate, spiral, filiform, straight or curved, C-shaped or sigmoid, hyaline or pale-yellowish in mass, aseptate, ends rounded, with polar mucilaginous appendages, smooth-walled. Asexual morph: Undetermined.

 

Culture conditions: Ascospores germinating on MEA within 3 days. Colonies on MEA reaching 6–7.5 cm diameter after two months at 25 °C, white at the edge, brown in the center with strong radiations outwards, after 30 days of incubation, colonies smooth-walled, flat, margin lobate, white at the center and become brown at the margin, hyphae, septate, branched and smooth-walled.

 

 

Leptosporella arengae (MFLU 15–0305, holotype). (A) Appearance of ascomata on host substrate. (B, C) Close up of ascomata. (D) Yellowish ascospore mass. (E) Section of ascoma. (F) Peridium. (G–I) Asci. (J–M) Ascospores. (N) Paraphyses. (O) J- reaction of apical ring. Scale bars: B = 1,000 μm, C–D = 500 μm, E = 200 μm, F–M = 50 μm, N–O = 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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