A new species of Tremella s. s. (Tremellaceae, Basidiomycota) from southeastern China Author Fan, Long Fei 0000-0001-9784-758X School of Ecology and Nature Conservation, Institute of Microbiology, Beijing Forestry University, Beijing 100083, China & Guizhou Academy of Agricultural Sciences, Guizhou Key Laboratory of Edible fungi breeding, Guizhou Guiyang, 550006, China & College of Forestry, Beijing Forestry University, Beijing 100083, China & longfeifan 2016 @ yahoo. com; https: // orcid. org / 0000 - 0001 - 9784 - 758 X longfeifan2016@yahoo.com Author Pu, Jin Bao 0000-0003-4911-1169 Zhejiang Academy of Traditional Chinese Medicine, Hangzhou 310012, China & pjb 0225 @ 163. com; https: // orcid. org / 0000 - 0003 - 4911 - 1169 Author Wu, Fang 0000-0002-1455-6486 School of Ecology and Nature Conservation, Institute of Microbiology, Beijing Forestry University, Beijing 100083, China & fangwubjfu 2014 @ yahoo. com; https: // orcid. org / 0000 - 0002 - 1455 - 6486 fangwubjfu2014@yahoo.com Author Dai, Yu Cheng 0000-0002-6523-0320 School of Ecology and Nature Conservation, Institute of Microbiology, Beijing Forestry University, Beijing 100083, China & yuchengd @ yahoo. com; https: // orcid. org / 0000 - 0002 - 6523 - 0320 yuchengd@yahoo.com text Phytotaxa 2021 2021-05-24 502 2 208 216 http://dx.doi.org/10.11646/phytotaxa.502.2.9 journal article 10.11646/phytotaxa.502.2.9 1179-3163 5425037 Tremella zhejiangensis F. Wu, L.F. Fan & Y.C. Dai , sp. nov. Figs. 2 , 3 MycoBank number: MB838848 Diagnosis:—Differs from other similar species ( T. cerebriformis and T. salmonea ) by the yellowish brown to brownish orange basidioma and smaller basidiospores, 15.0–19.0 × 14.0–17.5 μm. Holotype :— CHINA . Zhejiang , Jinhua , Panan , on rotten trunk of Liquidambar formosana , 24 April 2020 , F . Wu 346 ( BJFC033064 ). Etymology :—Refers to the distribution of the species in Zhejiang , China . FIGURE 2 A basidioma of Tremella zhejiangensis (Wu 346). Scale bar = 1.0 cm. Photo by: Jin-Bao Pu. Description :— Basidioma sessile, soft gelatinous when fresh, yellowish brown to brownish orange, irregularly cerebriform, small undulate lobes (not hollow), up to 2.8 cm long, 1.5 cm broad and 1.2 cm high from base, firmly gelatinous and brownish orange when dry, broadly attached to substrate. Micromorphology : — Hyphae smooth, hyaline or covered by gold amorphous matter, thin-walled, 1.5–3.9 µm in diam, branched, interwoven, with abundant clamp connections; hyphidia occasionally present, unbranched, non septate, smooth, hyaline, thin-walled, 2.0–3.3 µm diam; swollen cells, haustoria and vesicles not seen; probasidia mostly globose to ovoid; mature basidia globose to subglobose or broadly ellipsoid, thin-walled, with a basal clamp connection, 27.0–38.0 × 24.0–34.0 µm, usually longitudinally septate or cruciate septate, 2–4-celled, with obvious oil drops, sterigmata up to 45.0 μm long and 4.0–6.0 μm in diam, not protuberant at apex; basidiospores hyaline, thin-walled, globose to subglobose, apiculate, with obvious oil drops, 15.0–19.0(–19.5) × 14.0–17.5(–18.0) μm, L = 17.2 µm, W = 16.06 µm, Q = 1.07–1.11 (n = 60/2), occasionally germinating by germ tubes; conidia uncertain, some cylindrical or ovoid cells (conidia-like cells) may function as conidia. Notes :— Tremella zhejiangensis is characterized by soft gelatinous, yellowish brown to brownish orange, cerebriform basidioma when fresh, larger basidia and basidiospores than most species in Tremella s.s . , and growing on rotten wood of Liquidambar formosana . Two new specimens form an independent lineage in the phylogeny ( Fig. 1 ). Additional specimen examined (isotype):— CHINA . Zhejiang , Jinhua, Panan, on rotten trunk of Liquidambar formosana , 24 April 2020 , F. Wu 391 (BJFC033388).