Description from Flora of China
Quercus lungmaiensis (Hu) C. C. Huang & Y. T. Chang; Cyclobalanopsis fulviseriaca Y. C. Hsu & D. M. Wang; C. longifolia Y. C. Hsu & Q. Z. Dong; Q. fulviseriaca (Y. C. Hsu & D. M. Wang) Z. K. Zhou; Q. yongchunana Z. K. Zhou.
Trees to 30 m tall. Branchlets conspicuously sulcate, glabrous. Petiole 2-2.5(-4) cm, adaxially sulcate, glabrous; leaf blade green, oblong, obovate-elliptic, or ovate-lanceolate, 9.5-11.5 × 3-4 cm, subleathery, abaxially grayish green and with simple hairs or glabrous, adaxially green and glabrous, base cuneate to subrounded, margin basally entire but apically awnlike serrate, apex acuminate to caudate; midvein abaxially prominent and adaxially impressed; secondary veins 13-17 on each side of midvein; tertiary veins abaxially conspicuous. Female inflorescences ca. 2.5 cm; rachis slender, sparsely tomentose. Cupule bowl-shaped, 0.7-1 × ca. 1.5 cm, enclosing 1/3-1/2 of nut, outside sparsely tomentose; bracts in 7-9 rings, margin of basal ones 1 or 2 denticulate, others subentire to repand-dentate. Nut broadly ovoid to oblate, 1.2-2 cm, apex flat or depressed and velutinous; scar flat and rounded. Fl. Mar-Apr, fr. Oct.
* Rocky mountains; 1100-1300 m. SE Yunnan