Phylloporia vietnamensis sp. nov. (Hymenochaetales, Basidiomycota) from Vietnam Author Wei, Hao-Wen 0009-0009-3563-2159 College of Life Science, Liaoning University, Shenyang 110036, China & State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China weihaowen199907@163.com Author Zhao, Jing 0009-0003-8184-9291 College of Life Science, Liaoning University, Shenyang 110036, China & State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China 1391406668@qq.com Author Wang, Yan 0009-0003-4426-9693 College of Life Science, Liaoning University, Shenyang 110036, China & State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China 2622676794@qq.com Author Liu, Shi-Liang 0000-0001-7556-2575 State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China liushiliang@im.ac.cn Author Wang, Xue-Wei 0000-0002-3885-9190 State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China & University of Chinese Academy of Sciences, Beijing 100049, China xuewei_wang1995@im.ac.cn Author Zhou, Li-Wei 0000-0002-2851-2839 College of Life Science, Liaoning University, Shenyang 110036, China & State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China liwei_zhou1982@im.ac.cn text Phytotaxa 2024 2024-03-12 640 3 243 254 http://dx.doi.org/10.11646/phytotaxa.640.3.2 journal article 300698 10.11646/phytotaxa.640.3.2 edf27741-6e76-4323-8385-75f43ac09c11 1179-3163 13213594 Phylloporia vietnamensis L.W. Zhou, H.W. Wei & S.L. Liu , sp. nov. ( Figs. 3 , 4 ) Fungal names number : FN 571847 Type : Vietnam , Dong Nai Province , Dinh Quan District, Thac Mai Preservation Park, on the ground under angiosperm forest, 14 October 2017 , L.W. Zhou , LWZ 20171014-13 ( holotype in HMAS ). Etymology : vietnamensis (Lat.) , refers to the country “ Vietnam ” where the holotype was collected. Diagnosis: Differing from other species of Phylloporia by annual, terrestrial, eccentrically stipitate basidiomes, small pores (9–11 per mm), a dimitic hyphal system in the upper tomentum, and the presence of cystidioles. Description: Basidiomes annual, eccentrically stipitate, without odor or taste, becoming lighter and hard when dry. Pilei semi-circular to circular, up to 4.5 cm long, 2.5 cm wide, and 0.1–0.3 cm thick. Pileal surface honey-yellow to grayish brown when dry, concentrically sulcate. Pore surface honey-yellow to grayish brown when dry; pore 9–11 per mm; dissepiments thin, entire. Context thin, up to 1.3 mm thick, duplex, separated with a black line, the lower context cinnamon-buff, hard corky, up to 1 mm thick, the upper context as tomentum, clay-buff, up to 0.3 mm thick. Tubes honey-yellow, woody, up to 2 mm long. Stipe honey-yellow to grayish brown, cylindrical or more frequently flattened, up to 3 cm long and 1.5 cm in diam. FIGURE 1. Phylogenetic position of Phylloporia vietnamensis (in boldface) inferred from the ITS and nLSU regions. The topology resulting from the maximum likelihood analysis is presented with bootstrap values and Bayesian posterior probabilities equal to or above 50% and 0.7, respectively, at the nodes. FIGURE 2. Phylogenetic position of Phylloporia vietnamensis (in boldface) inferred from the nLSU region. The topology resulting from the maximum likelihood analysis is presented with bootstrap values and Bayesian posterior probabilities equal to or above 50% and 0.7, respectively, at the nodes. FIGURE 3. Basidiomes of Phylloporia vietnamensis (LWZ 20171014-13). Scale bars: 2 cm. FIGURE 4. Microscopic structures of Phylloporia vietnamensis (drawn from the holotype). A. Basidioles; B. Basidia; C. Cystidioles; D. Basidiospores; E. Hyphae from upper tomentum; F. Hyphae from lower context. G. A vertical section of the trama. Scale bars: A–C: 15 μm; D: 5 μm; E–G: 20 μm. Hyphal system dimitic in upper tomentum, monomitic in lower context and trama; generative hyphae simple septate; tissue darkening but otherwise unchanged in KOH. In upper tomentum, generative hyphae colorless to buff-yellow, thick-walled, unbranched, 3.5–6 μm in diam; skeletal hyphae infrequent, golden yellow, thick-walled, unbranched, 4–6 μm in diam. In lower context, generative hyphae colorless to buff-yellow, thin to thick-walled, occasionally branched, 2.5–5 μm in diam. Tube generative hyphae colorless to coral, subparallel along the tubes, thin to thick-walled, occasionally branched, 2.5–4.5 μm in diam. Cystidioles rarely present, lageniform, colorless, thin-walled, 10–15 × 3–5 μm. Basidia clavate to subclavate, with four sterigmata, colorless, thin-walled, 8–12 × 3–5 μm; basidioles similar to basidia in shape, but slightly smaller. Basidiospores abundant, slightly thick walled, ellipsoid, yellowish, inamyloid, acyanophilous, 3–4 × (1.8–)2–2.4 µm, L = 3.45 µm, W = 2.1 µm, Q = 1.64 (n = 30/1).