Retiboletus Manfr. Binder & Bresinsky
Creators: name: Li, Jin
name: Wang, Zhen
name: Liu, En-De
name: Yang, Zhu L.
name: Li, Yan-Chun
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Fungi
Basidiomycota
Agaricomycetes
Boletales
Boletaceae
Retiboletus

description: Key to the species of Retiboletus in China
1. Hymenophore bright yellow to brownish-yellow, stipe yellow to orange-yellow, mycelium on the base of stipe yellow to brownishyellow .................................................................................................................................................................................................2
1. Hymenophore whitish to grayish white, stipe black to blackish or grayish-black, mycelium on the base of stipe whitish to grayishwhite ...................................................................................................................................................................................................3
2. Basidiomata medium-sized to large, pileus up to 15 cm in diam.; distributed in subtropical to temperate forestes ........................... ........................................................................................................................................................................................ R. kauffmanii
2. Basidiomata small to medium-sized, pileus up to 10 cm in diam.; distributed in tropical forestes..................................... R. sinensis
3. Pileus smoky-gray to gray or black to grayish black, always with an olivaceous tinge; context of pileus white to grayish white with olivaceous tinge, staining brownish to fuliginous when injured; context of stipe dark green to olivaceous when cut, staining brownish to fuliginous when injured..................................................................................................................................................4
3. Pileus without olivaceous tinge; context of pileus white to grayish white without olivaceous tinge, color unchanged when hurt; context of stipe white to grayish white in the upper part and grayish yellow to brownish yellow at base, color without discoloration or sometimes staining brown when injured........................................................................................................................................5
4. Pileus smoky-gray to gray with olivaceous tinge; hymenophore initially white and then lilac to purplish; basidiospores 9–11 × 4–5 μm...................................................................................................................................................................................... R. zhangfeii
4. Pileus black to grayish black with olivaceous tinge; hymenophore white to grayish white without lilac to purplish tinge; basidiospores relatively small 8–10.5 × 3.5–4 μm............................................................................................................................. R. nigrogriseus
5. Basidiomata distributed in tropical forests; pileipellis a palisadoderm composed of vertically arranged broad hyphae up to 15 μm wide ....................................................................................................................................................................................................6
5. Basidiomata distributed in subtropical forests, or subtropical to temperate forests; pileipellis a palisadoderm composed of vertically arranged broad hyphae up to 16 μm wide, or a trichoderm composed of interwoven hyphae up to 8 μm wide ...............................7
6. Pileus brown to blackish brown; basidiospores 9.5–11 × 4–4.5 μm; basidia 23–29 × 8–10 μm; pleurocystidia 40–60 × 9–11 μm .. .................................................................................................................................................................................. R. pseudogriseus
6. Pileus pale brown to grayish brown; basidiospores relatively large measuring 10–12.5 × 4.5–5 μm; basidia relatively large measuring 35–40 × 10–12 μm; pleurocystidia relatively large measuring 50–80 × 9–14.5 μm................................... R. brunneolus
7. Basidiomata distributed in subtropical forests; pileipellis a palisadoderm composed of vertically arranged broad hyphae up to 16 μm wide ..............................................................................................................................................................................................8
7. Basidiomata distributed in subtropical to temperate forests; pileipellis a trichoderm composed of interwoven hyphae up to 8 μm wide ....................................................................................................................................................................................................9
8. Pileus black to blackish; basidiospores small mostly 8–10.5 × 3–4.5 μm; context in stipe without grayish green discoloration when injured....................................................................................................................................................................................... R. ater
8. Pileus dark brown, brown, black, or brown-gray in the center and brownish or grayish towards margin; basidiospores large mostly 10–13 × 4–5 μm; context in stipe with grayish green discoloration when injured .............................................................................. ....................................................................................................................................................................................... R. cyanescens
9. Pileus grayish brown to grayish black; basidiospores 9–12 × 3.5–4 μm .............................................................................. R. fuscus
9. Pileus grayish brown to brown without black tinge; basidiospores relatively large mostly 10–13.5 × 4–5 μm........... R. sinogriseus
description: Published as part of Li, Jin, Wang, Zhen, Liu, En-De, Yang, Zhu L. & Li, Yan-Chun, 2022, Morphological and molecular data reveal Retiboletus cyanescens sp. nov. and the new subgenus Nigroretiboletorum (Boletaceae), pp. 232-242 in Phytotaxa 572 (3) on pages 240-241, DOI: 10.11646/phytotaxa.572.3.2, http://zenodo.org/record/7322210