Morphology and specimen distribution of Clade 4 Russula rhodocephala (Woo sp. 35). BW followed by numerals designate Ben Woo samples. a Photo by B. Woo, BW337, scanned image from WTU. b Distribution of specimens of the Woo collections in Pacific Northwest. c–h Micromorphology, all 1000x magnification. c Spores in median optical section and surface view in Melzer’s reagent (c–c2, BW438; c3–c4, BW438; c5–c6, BW337; c7–c8, BW860; c9–c10, BW337; c11–c12, BW463). d–e Basidia (BW361, BW463). f–h Cap cuticle terminal cells with refringent contents (BW337, BW201, BW201). Scale bars 10 µm