Description from Flora of China
Pseudobulbs golden yellow when dried, lucid, narrowly ovoid or narrowly ovoid-ellipsoid, 3.5-7 × 1-2 cm, rugose-grooved. Leaves 2, oblong-lanceolate or nearly lanceolate, 16-43 × 1.5-3 cm, papery, base cuneate, apex long acuminate; petiole 5-12 cm, grooved. Inflorescence laxly 10-15-flowered; peduncle 30-66 cm; rachis 6-16 cm, glabrous; floral bracts pale reddish green, broadly ovate, 1.5-2 × 1.2-1.5 cm, papery, subacute. Flowers white, with pale brown lip and reddish brown anther cap; pedicel and ovary 6-7 mm, glabrous. Sepals subsimilar, 5-veined; dorsal sepal ovate-oblong, 12-14 × 4-5 mm, apiculate; lateral sepals nearly narrowly ovate-lanceolate, oblique, 15-18 × 5-6 mm, apiculate. Petals elliptic-oblong, 15-18 × 2-3 mm, 3-veined, oblique, acute to apiculate; lip 12-14 × 5-6 mm, deeply constricted at middle, spurred, entire; hypochile ovate-elliptic, concave at base; epichile reniform, emarginate; disk with 3 thickened, keeled veins on mesochile; spur arising from between sepals, cylindric, curved-porrect. Column 8-10 mm, upper wings 2-3 mm wide, glabrous. Capsule erect, ellipsoid, 1.5-2 cm × 8-10 mm. Fl. Jul-Aug, fr. Oct.
Epiphytic on tree trunks in forests or lithophytic on rocks along valleys; 700-2700 m. NW to SE Yunnan [Bhutan, NE India].