Tricholoma tianshanense sp. nov., in Tricholoma sect. Caligata from Tianshan Mountains in China evidenced by morphological characters and phylogenetic analyses Author Zhao, Zhen-Xi Innovative Institute for Plant Health / Key Laboratory of Green Prevention and Control on Fruits and Vegetables in South China, Ministry of Agriculture and Rural Affairs, Zhongkai University of Agriculture and Engineering, Guangzhou, 510225, China. & College of Life Sciences and Technology, Tarim University, Aral, 843300, China. Author Song, Jia-Ge 0000-0002-7630-3927 Innovative Institute for Plant Health / Key Laboratory of Green Prevention and Control on Fruits and Vegetables in South China, Ministry of Agriculture and Rural Affairs, Zhongkai University of Agriculture and Engineering, Guangzhou, 510225, China. & jiagesong @ sina. com; https: // orcid. org / 0000 - 0002 - 7630 - 3927 jiagesong@sina.com Author Senanayake, Indunil C. 0000-0002-7165-2394 Innovative Institute for Plant Health / Key Laboratory of Green Prevention and Control on Fruits and Vegetables in South China, Ministry of Agriculture and Rural Affairs, Zhongkai University of Agriculture and Engineering, Guangzhou, 510225, China. & indunilchinthani @ gmail. com; https: // orcid. org / 0000 - 0002 - 7165 - 2394 indunilchinthani@gmail.com Author Wu, Dong-Sheng 0000-0002-2832-8775 Tianshan State-owned Forest Protection Center of Aksu Prefecture, Aksu, 843006, China. & 1254487275 @ qq. com; https: // orcid. org / 0000 - 0002 - 2832 - 8775 1254487275@qq.com Author Wang, Guo-Qing 0000-0002-4544-8656 Tomur mountains National Nature Reserve Administration Bureau, Aksu, 843006, China. & 1345255246 @ qq. com; https: // orcid. org / 0000 - 0002 - 4544 - 8656 1345255246@qq.com Author Xu, Biao 0000-0003-1095-8901 Innovative Institute for Plant Health / Key Laboratory of Green Prevention and Control on Fruits and Vegetables in South China, Ministry of Agriculture and Rural Affairs, Zhongkai University of Agriculture and Engineering, Guangzhou, 510225, China. & College of Life Sciences and Technology, Tarim University, Aral, 843300, China. & biaoxu 2008 @ hotmail. com; https: // orcid. org / 0000 - 0003 - 1095 - 8901 biaoxu2008@hotmail.com text Phytotaxa 2022 2022-06-02 549 1 22 30 journal article 218956 10.11646/phytotaxa.549.1.2 c999e806-5019-4267-9019-4221c1c1104f 1179-3163 6605290 Tricholoma tianshanense Z.X. Zhao, J.G. Song & B. Xu sp. nov.— FIGURES 2 , 3 MycoBank: MB842138 FIGURE 2 . Basidiomata of Tricholoma tianshanense (HMUT 1112, holotype). a. Obverse view, b. Reverse view. Bars = 2 cm. FIGURE 3 . Micro-characteristics of Tricholoma tianshanense (HMUT 1112, holotype). a. Basidiospores; b. Basidia; c. Pileipellis; d. Lamellar trama; Bars a, b = 10 μm, c, d = 20 μm. Etymology :—Species epithet based on the Tianshan Mountain in Xinjiang , China , where the species was collected. Diagnosis :—Characterized by fairly inconspicuous, cottony-woolly ring, red to brownish-red scales gradually thinning out towards the marginal zone on the pileus, rarely clamped, guttulated basidiospores. Holotype :— CHINA , Xinjiang Province , Hejing county , Dalongchi Park ( 42°27′34″N , 80°22′51″E ), alt. 2650 m , on rich soil with continuous and thick moss cover in a coniferous forest dominated by plants of Picea schrenkiana Fisch. & C.A.Mey. , 11 Sept. 2020 , Z . X. Zhao & B . Xu , HMUT 1112 . GenBank accession numbers :—ITS: OL584020 , LSU: OL584019 (not used in the analyses). Description :— Pileus 4–9 cm in diam, at first hemispherical to convex with involute margin, later convex to planodepressus, breaking up into appressed soon in central part, ± confluent fibrilloso-scales, which are red, to brownish red, scales gradually thinning out towards the marginal zone; margin slightly incurved, thin and sharp, sometimes torn. Lamellae emarginate, whitish to cream-colored, somewhat sinuate, rather close to medium spaced. Stipe 50–100 × 20–25 mm , solidus, cylindrical or tapering downwards, with a persistent but fairly inconspicuous, cottony-woolly ring on the upper part of the stipe, whitish and granulose scales above ring, below ring with irregular, light red to dark red fibrilloso-scales. Flesh whitish, solid; Odor very strong, especially when being fresh, like perfume; taste unknown. Basidiospores (4.5–)5.0–5.9(–7) × (4–)4.6–5(˗6) μm [n=50, Q=(1.02–)1.08–1.50(–1.57), Q=1.29 ± 0.12], broadly ellipsoid to ellipsoid, non-amyloid, hyaline, guttulate, thin-walled, smooth. Basidia (29–)30–41(–45) × 5–8 μm, clavate, 4-spored, rarely 2-spored, hyaline, sterigmata up to 4 μm long. Pleurocystidia / cheilocystidia undetermined. Lamellar trama regular, hyaline, parallel, thin-walled hyphae 5–10 µm diam., sometimes branched. Pileipellis cutis, composed of hyaline, cylindrical, thin-walled hyphae 6–17 µm diam., sometimes branched. Stipitipellis formed by cylindrical 5–12 µm wide hyphae. Clamps present but rare. Ecology & Habitat :—Solitary to scattered on soil with thick mosses cover in forests dominated by Picea schrenkiana , fruiting in summer at alt 2650 m . Distribution :—Currently known only Hejing county, Xinjiang Province , China . Additional specimen examined :— CHINA . Xinjiang Province , Hejing ( 42°27′34″N , 80°22′51″E ), alt. 2650 m , on rich soil with continuous and thick moss cover in a coniferous forest dominated by plants of Picea schrenkiana , 11 Sept 2020 , Z . X. Zhao & B . X., HMUT 1114 . GenBank accession numbers :—ITS: OL584021 , LSU: OL584017 (not used in the analyses).