Morphological and molecular data reveal Retiboletus cyanescens sp. nov. and the new subgenus Nigroretiboletorum (Boletaceae) Author Li, Jin Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, 650201, Kunming, China & School of Life Science, Yunnan University, Kunming, 650504, China Author Wang, Zhen Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, 650201, Kunming, China & Yunnan Key Laboratory for Fungal Diversity and Green Development, Kunming, 650201, China Author Liu, En-De 0000-0003-4424-9820 Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, 650201, Kunming, China & liuende @ mail. kib. ac. cn; https: // orcid. org / 0000 - 0003 - 4424 - 9820 liuende@mail.kib.ac.cn Author Yang, Zhu L. Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, 650201, Kunming, China & Yunnan Key Laboratory for Fungal Diversity and Green Development, Kunming, 650201, China Author Li, Yan-Chun Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, 650201, Kunming, China & Yunnan Key Laboratory for Fungal Diversity and Green Development, Kunming, 650201, China text Phytotaxa 2022 2022-11-15 572 3 232 242 http://dx.doi.org/10.11646/phytotaxa.572.3.2 journal article 188149 10.11646/phytotaxa.572.3.2 b03f9149-728d-4094-be89-e05740500909 1179-3163 7322210 Retiboletus subg . Retiboletus Type : Retiboletus ornatipes (Peck) Binder & Bresinsky, Feddes Repert 113(1–2): 37 (2002). Diagnosis : Retiboletus subg. Retiboletus differs from R . subg. Nigroretiboletorum by its yellow to light yellow hymenophore and context, which is unchanging or staining yellow to yellowish brown when injured. Description : Basidiomata small to large-sized. Pileus subhemispherical to broadly convex, sometimes applanate; surface dry, velutinous to tomentose to matted tomentose, yellowish brown, gray brown to brown or yellow, sometimes with olive tinge; margin incurved; context pale yellow to light yellow, unchanging or staining yellow to yellowish brown in color when injured. Hymenophore poroid, adnate or slightly depressed around apex of stipe; pores angular pale yellow, yellow, to light yellow, usually changing yellowish brown to brown or pale orange when injured; tubes yellowish to light yellow, usually changing yellowish brown, pale brown when injured. Stipe central, subcylindric, solid, usually flexuous; surface dry, yellowish, yellow to brownish yellow, prominently and coarsely reticulate nearly to base or the upper; reticulum brownish black or yellow to light yellow; context yellow, unchanging or changing vivid yellow or yellowish brown in color when injured; annulus absent. Basal mycelium yellow. Odor indistinct. Basidiospores smooth, subfusiform to ellipsoid; Cheilo- and pleurocystidia abundant, fusiform or subfusiform; Pileipellis a trichoderm composed of vertically or interwoven thin-walled hyphae; Stipitipellis hymeniform, composed of thin-walled hyphae with narrowly or broadly clavate, subfusiform or fusiform terminal cells. Clamp connections absent in all tissues. Ecology and distribution : Known from northern Central America and East Asia , associated with species of the family Fagaceae and the family Pinaceae . Currently known species : Retiboletus brevibasidiatus Raspé & Chuankid (2021: 297) , R . flavoniger (Halling, G.M. Muell. & L.D. Gómez) Binder & Halling (2002: 30) , R . kauffmanii , R . ornatipes , R . retipes , R . sinensis N.K. Zeng & Zhu L. Yang (2016: 363).