A novel species of Phaeoisaria (Pleurotheciaceae, Sordariomycetes) from the Tibetan Plateau, China Author Xu, Ke College of Landscape and Horticulture, Yunnan Agricultural University, Kunming, Yunnan 650201, P. R. China & Key Laboratory for Plant Diversity and Biogeography of East Asia, Yunnan Key Laboratory of Fungal Diversity and Green Development, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan 650201, P. R. China Author Xu, Rong-Ju 0000-0002-3968-8442 Key Laboratory for Plant Diversity and Biogeography of East Asia, Yunnan Key Laboratory of Fungal Diversity and Green Development, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan 650201, P. R. China xurongju1005@outlook.com Author Li, Jia-Ning College of Landscape and Horticulture, Yunnan Agricultural University, Kunming, Yunnan 650201, P. R. China & Key Laboratory for Plant Diversity and Biogeography of East Asia, Yunnan Key Laboratory of Fungal Diversity and Green Development, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan 650201, P. R. China Author Zhao, Qi 0000-0001-8169-0573 Key Laboratory for Plant Diversity and Biogeography of East Asia, Yunnan Key Laboratory of Fungal Diversity and Green Development, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan 650201, P. R. China zhaoqi@mail.kib.ac.cn Author Zhu, Ying-An 0000-0001-6325-8605 College of Landscape and Horticulture, Yunnan Agricultural University, Kunming, Yunnan 650201, P. R. China zhuyingan2013@163.com text Phytotaxa 2024 2024-03-26 642 1 61 72 http://dx.doi.org/10.11646/phytotaxa.642.1.5 journal article 10.11646/phytotaxa.642.1.5 1179-3163 13214167 Phaeoisaria sedimenticola X.L. Cheng & Wei Li ter, Mycotaxon 127: 20 (2014) FIGURE 4 Index Fungorum number: 563661; Facesoffungi number: FoF 14963 Saprobic on decaying submerged wood in a freshwater stream. Asexual morph: Colonies effuse, scattered, solitary, pale brown to dark brown, hairy or velvety, covered by white conidial mass. Mycelium is partly superficial, partly immersed in the substrate, consisting of branched, septate, smooth, subhyaline to pale brown hyphae. Synnemata 455–710 × 10–20 μm ( x = 590 × 15 μm, n = 10), macronematous, branched, synnematous, septate, straight or slightly flexuous, brown to dark brown, smooth. Conidiogenous cells 16–40 × 2–4 μm ( x = 27 × 3 μm, n = 10), polyblastic, hyaline to pale brown, sympodial, terminal, cylindrical, denticulate. Conidia 5–7 × 3–4 μm ( x = 6 × 3 μm, n = 20), ellipsoidal to obovoid, hyaline to pale brown, guttulate, smooth-walled, aseptate. Sexual morph: Undetermined. Culture characteristics: Conidia germinated on PDA within 48 hours, and germ tubes were produced from both ends. Colony reached 10 mm at room temperature for one week, circular, flat, with fluffy, dense, raised mycelium in the center. Material examined : CHINA , Xizang , Motuo County, saprobic on decaying submerged wood in a freshwater stream, 12 July 2022 , R .J. Xu, LJR-8 ( HKAS 128986), living culture, KUNCC 10456. Notes: Cheng et al . (2014) introduced Phaeoisaria sedimenticola from surface marine sediment in an intertidal zone in Shandong , China . Morphologically, our collections are consistent with P. sedimenticola . Phylogenetic analyses showed that P. sedimenticola ( KUNCC 10456) clustered into a clade with an ex-type strain of P. sedimenticola ( CGMCC 3 14949) with 100% ML /1.00 PP bootstrap support ( FIGURE 1 ).