Helicascus alatus M. Zeng, S.K. Huang, Q. Zhao & K.D. Hyde, 2018

Zeng, Ming, Huang, Shi-Ke, Hyde, Kevin D. & Zhao, Qi, 2018, Helicascus alatus (Morosphaeriaceae), a new freshwater species from southwestern China, Phytotaxa 351 (3), pp. 210-218 : 215

Helicascus alatus M. Zeng, S.K. Huang, Q. Zhao & K.D. Hyde , sp. nov. FIGURE 2

Index Fungorum number: IF 553966; Facesoffungi number: FoF 03858.

Etymology: The name alatus refers to the ascospore have a sheath like wings.

Holotype: HKAS 99554 .

Saprobic on submerged wood. Sexual morph: Ascomata 345–376 × 640–686 μm, immersed, solitary, scattered, unilocular, subglobose to globose, black. Neck 265–400 μm, central, cylindrical, periphyses distinct. Peridium 31–75 μm thick, comprising outer layers with several brown, thick-walled cells of textura angularis and inner layers with hyaline, thin-walled cells of textura angularis. Hamathecium 1–2 μm wide, comprising septate pseudoparaphyses. Asci 99–114 × 17–37 μm (x = 107 × 20 μm, n = 20), 8-spored, bitunicate, fissitunicate, clavate, with a short pedicel, non-amyloid. Ascospores 22.5–27 × 8–11 μm (x = 24.7 × 9.6 μm, n = 50), 2-seriate at the apex, overlapping 1- seriate at the base, ellipsoid to fusiform, irregular, 1–2-septate, guttulate, hyaline when young and brown when mature, slightly constricted at the septum, smooth and thick-walled with a wing-like sheath. Asexual morph: Undetermined.

Material examined:— CHINA, Yunnan Province, Baoshan ; on unidentified submerged wood, 1 October 2016; S. K. Huang, ( KUN HKAS 99554 , holotype), Ex-type KUMCC 17-0145 ; ibid. ( MFLU 17-1189 , isotype) ; living culture, MFLUCC 17-2300 ; ibid. ( KUN HKAS 99553 , MFLU 17-1191 ), living culture, KUMCC 17-0147 .

1 Zhang et al. (2014); 2 Preedanon et al. (2017); 3 Luo et al. (2016); 4 Zhang et al. (2015); 5 Zhang et al. (2013); 6 Tanaka et al. (2015); 7 Hyde (1991)

Figures

FIGURE 2. Helicascus alatus (HKAS 99554, holotype). a Material. b Ascomata on host. c Ascoma d Ascoma in vertical section. e Neck in transverse section with periphyses f Peridium. g Asci with pseudoparaphyses. h Ascus i–l Ascospores with gelatinous sheath (arrowed). Note: Figs k–l stained in Congo red reagent. Scale bars: d = 200 μm, e, g–h = 50 μm, f, i–l = 20 μm.