taxonID	type	description	language	source
3129A832FFFB564B40BFD7D6FC43FD34.taxon	diagnosis	Diagnosis: Distinguished from other species of Acyanoboletus by its rugose pileus surface and additionally differs from A. controversus by longer basidiospores, and differs from A. dissimilis (E. Horak & G. Wu 2023: 755) by the larger basidioma and nearly glabrous stipe. Holotype: CHINA, Yunnan Province, Xishuangbanna Dai Autonomous Prefecture, Mengla County, Xishuangbanna National Natural Reserve, elev. 1030 m, 6 July 2014, Gang Wu 1259 (HKAS 88996). Gene sequences ex-holotype: PQ 514134 (ITS), PQ 517512 (nrLSU), PQ 536872 (TEF 1), PQ 536877 (RPB 1), PQ 536882 (RPB 2). Etymology: rugosipileus (Lat.), in reference to the rugose pileus of this species. Pileus 4 – 9 cm diam., convex to broadly convex, surface usually rugose when mature; olive brown (4 E 8 – 4 C 4), chamois to bamboo yellow (4 C 4 – 4 C 5), brownish orange (5 C 4 – 5 C 5), light brown (5 D 4 – 5 D 5), sometimes paler in the margin, slightly viscid when wet, sterile margin present and often involute; context 9 – 11.5 mm thick, light yellow (4 A 4), yellowish white to pale yellow (1 A 2 – 1 A 3), unchanging upon exposure. Hymenophore sinuate, 3.5 – 11 mm thick; surface and tubes concolorous, pale yellow to pastel yellow (2 A 3 – 2 A 4) when young, wax yellow to absinthe yellow (3 B 5 – 3 C 5) in age, unchanging when bruised; pores roundish, 2 per mm. Stipe 6 – 9 cm long, 0.7 – 1.4 cm diam., central, subcylindrical, curved, firm, solid; surface dull yellow to straw yellow (3 B 3 – 3 B 4), golden yellow to grayish orange (5 B 6 – 5 B 7), often with brown tinge, covered with darker granules, sometimes with indistinctive reticulations or longitudinal striations on the upper part, unchanging when touched; context firm, pale yellow mixed with dull yellow, unchanging on exposure. Basal mycelium milky white. Basidiospores (9.5) 10 – 12 (12.5) × (4) 4.5 – 5.5 μm [Q = (1.85) 1.89 – 2.55 (2.93), Q m = 2.18 ± 0.20], fusiform and inequilateral in side view, with suprahilar depression, fusiform in face view, yellowish, smooth, thin-walled. Basidia 26 – 45 × 8.5 – 12.5 μm, broadly clavate, 4 - spored, rarely 2 - spored, sterigmata up to 4.5 µm long. Cheilocystidia 33 – 60 × 7 – 10 μm, abundant, subfusoid to lanceolate, with short to long beaks, thin-walled. Pleurocystidia 32 – 86 × 6 – 14 μm, scattered, subfusoid, lanceolate to broadly ventricose, with short to long beaks, thin-walled. Hymenophoral trama boletoid, 4.5 – 10 μm wide. Pileipellis an intricate trichoderm to interwoven subcutis, about 150 μm thick, composed of filamentous hyphae 4 – 7 μm wide, thin-walled, with subcylindrical terminal cells 20 – 77 × 4 – 8 μm, thin-walled. Pileal trama composed of interwoven hyphae 4 – 10 μm wide. Stipitipellis 60 – 90 μm thick, hymeniform with short-clavate terminal cells (17.5 – 31 × 6 – 13 μm). Stipe trama composed of longitudinally arranged parallel thin-walled hyphae 4 – 14 μm wide. Clamp connections absent. Habitat and distribution: — On soil in broad-leaved forests dominated by Fagaceae trees (Lithocarpus spp., Castanopsis spp., etc.). May to July. Currently only known in tropical to subtropical regions of China. Additional specimens examined: — CHINA, Guangdong Province: Shenzhen City, 2 May 2024, SF 1443724056718 - 3 (HKAS 136929). Chongqing Municipality, Beipei District, 30 June 2024, SF 1448175774620 - 4 (HKAS 144431); ibid., Jiangjin District, 4 July 2024, Xuemei Li YT 7476700591476 - 6 (HKAS 144429); ibid., Jiangjin District, 25 June, Haolong Zeng & Chuan Xing SF 1448335984750 - 3 (HKAS 144430)	en	Zhang, Xin, Li, Guangmei, Wang, Yuhang, Wu, Gang (2025): A new species of the subfamily Suillelloideae (Boletaceae, Boletales) from China. Phytotaxa 689 (2): 204-212, DOI: 10.11646/phytotaxa.689.2.3, URL: https://doi.org/10.11646/phytotaxa.689.2.3
