Quercus phanera Chun, J. Arnold Arbor. 28: 242. 1947; Q. basellata Chun & W. C. Ko; Q. insularis Chun & P. C. Tam (1965), not Borzi (1911).

Trees to 25 m tall. Branchlets tomentose, glabrescent. Petiole 1-1.8 cm; leaf blade bright green, oblong-elliptic to somewhat obovate, 5-15 × 2-6 cm, thickly leathery, glabrous, base cuneate and oblique, margin apical 1/2 serrate, apex with a short, blunt tip; midvein abaxially prominent but adaxially flat; secondary veins 7-10 on each side of midvein; tertiary veins abaxially slender, evident. Female inflorescence ca. 5 mm, cupules usually 1. Infructescences ca. 1 cm; rachis thick, lenticellate. Cupule bowl-shaped, 1-1.5 × 1.8-2.5 cm, enclosing ca. 1/4 of nut, outside pale grayish brown velutinous, inside brown tomentose, wall 2-3 mm thick; bracts in 8-12 rings, middle 4 or 5 wider and margin deeply dentate, apical 3 narrowest. Nut cylindric to ellipsoid, 3-4 × 2-2.5 cm, villous; scar 8-10 mm in diam., slightly convex; stylopodium persistent, ca. 3 mm in diam., base ringed. Fr. Dec-Jan.

* Mixed mesophytic forests in mountains; 900-2000 m. Guangxi, Hainan