Helicascus alatus (Morosphaeriaceae), a new freshwater species from southwestern China Author Zeng, Ming Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan 650201, P. R. China. & Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai, 57100, Thailand. Author Huang, Shi-Ke Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan 650201, P. R. China. & Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai, 57100, Thailand. & Engineering and Research Center of Southwest Bio-Pharmaceutical Resources, Ministry of Education, Guizhou University, Guiyang 550025, China Author Hyde, Kevin D. Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan 650201, P. R. China. & Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai, 57100, Thailand. Author Zhao, Qi Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan 650201, P. R. China. text Phytotaxa 2018 2018-06-06 351 3 210 218 http://dx.doi.org/10.11646/phytotaxa.351.3.2 journal article 10.11646/phytotaxa.351.3.2 1179-3163 13707282 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)