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.