Strobilomyces rubrobrunneus (Boletaceae), a new species with reddish brown scales from eastern China Author Han, Li-Hong College of Biological Resource and Food Engineering, Qujing Normal University, Qujing, Yunnan 655011, China Author Hao, Yan-Jia College of Horticulture, Anhui Agricultural University, Hefei, Anhui 230036, China Author Liu, Chao Center for Yunnan Plateau Biological Resources Protection and Utilization, Qujing Normal University, Qujing, Yunnan 655011, China Author Dai, Dong-Qin Center for Yunnan Plateau Biological Resources Protection and Utilization, Qujing Normal University, Qujing, Yunnan 655011, China Author Zhao, Kuan College of Life Science, Jiangxi Science & Technology Normal University, Nanchang 330013, China Author Tang, Li-Zhou Center for Yunnan Plateau Biological Resources Protection and Utilization, Qujing Normal University, Qujing, Yunnan 655011, China text Phytotaxa 2018 2018-11-20 376 4 167 176 http://dx.doi.org/10.11646/phytotaxa.376.4.2 journal article 10.11646/phytotaxa.376.4.2 1179-3163 13727713 Strobilomyces rubrobrunneus L.H. Han & Y.J. Hao , sp. nov. Figs. 2a–2c , 3 , 4 MycoBank: — MB 826851 Etymology: — “ rubrobrunneus ” refers to reddish-brown scales on pileus and stipe. Holotype : — CHINA . Anhui Province : Lu’an City, Jinzhai County, Huashi Town, Qianping Village, on the ground in a mixed forest of Castanea seguinii Dode , Quercus fabri Hance , Q. delavayi Franch and Pinus taiwanensis Hayata , 939 m , 25 July 2017 , Y.J. Hao 1589 (HKAS 101906!). Description: — Basidiomes tiny to small. Pileus 20–50 mm in diameter, convex to applanate, dry, covered with reddish-brown (6B4) to chocolate (5D8), adpressed to more or less erect pyramidal scales, 2–4 mm high, 3–5 mm in diameter at base, background light reddish-brown (4A3) to light chocolate (5D5); margin more or less appendiculate with triangular veil remnants concolorous with pileal ground; context white (8A1), staining grayish-black (7B1) then black (10E1) on exposure. Tubes emarginate with decurrent tooth, white (6A1) then smoky gray (8C1); pores angular, small, 0.5–1 mm in diameter; pores and tubes concolorous, whitish (14A1) then smoky gray (4D1), immediately staining rusty red (6D8) then black (17F8) on exposure. Stipe 30–50 mm long, 4–9 mm in diameter, subcylindrical, curved; surface reticulate due to the decurrence of tubes at apex, covered with light grayish-brown (6B3) to chocolate (5D8) fluff on the upper part and reddish-brown (6B4) to chocolate (5D8) fluff on the lower; context white (8A1), discoloration similar to that of tubes; annulus absent; basal mycelium dirty white (5B1) to grayish-white (6B1). FIGURE 2. Basidiomata of Strobilomyces rubrobrunneus . a–b. Basidioma (holotype). c–d. Grayish black color change when cut (image taken immediately after sectioning), c: holotype, d: HKAS 101904. Bars = 1 cm. Photos by Yan-Jia Hao. Basidiospores [80/4/3] 8–10 × 7–8(–8.5) μm (Q = 1.11–1.20(–1.29), Q m = 1.15 ± 0.04) excluding ornamentation, subglobose to broadly ellipsoid, dark brown (7D5), completely reticulate with meshes 1–2 μm in diameter and 1– 1.5 μm high; apiculus 0.5 μm long, with a smooth adaxial patch. Basidia 30–40 × 12–15 μm, narrowly clavate to clavate, 4-spored; sterigmata 5–8 μm long. Hymenophoral trama boletoid; hyphae cylindrical, 8–12 μm in diameter. Cheilocystidia 28–35 × 10–15 μm, subfusiform to sublageniform, hyaline or with yellow-brown (5B7) plasmatic pigment, thin-walled. Pleurocystidia 30–50 × 12–25 μm, narrowly lageniform to subfusiform with long beak, thin-walled. Pileipellis an intricate trichodermium, composed of 9–12 μm wide cylindric to submoniliform hyphae with short obtuse terminal cells; cell wall dark brown (5E8), slightly thickened (<1 μm). Pileal trama composed of 4–9 μm wide interwoven hyphae. Hyphae of scales on stipe similar to those on pileus. Stipe trama composed of 5–11 μm wide cylindrical hyphae. Clamp connections absent. Habitat and distribution: — Solitary in a mixed forest of Castanea seguinii , Quercus fabri , Q. delavayi and Pinus taiwanensis ; currently only known from the type locality. Additional specimens examined:— CHINA . Anhui Province : Lu’an City, Jinzhai County, Mazongling forestry station, alt. 800 m , in a mixed forest dominated by Quercus variabilis Blume , Q. fabri , Q. glauca Thunb. and Pinus massoniana Lamb. , 18 July 2017 , Y.J. Hao 1425 (HKAS 101904); Lu’an City, Jinzhai County, Mazongling forestry station, Qianping Village, alt. 947 m , in a mixed forest dominated by C. seguinii and Quercus chenii , 21 July 2017 , Y.J. Hao 1491 (HKAS 101905).