Pseudobulbs closely tufted, ovoid, often 4-ridged, 4-6 cm long, ca. 2 cm in diam., with 2 leaves at apex, base covered by 2-3 scales before maturity. Leaves oblanceolate or oblong, 15-35 cm long, 3.5-6 cm wide, acuminate or acute at apex, attenuate, canaliculate at base; veins and veinlets parallel, elavated on both surfaces. Peduncle from near apex of pseudobulb, 5-10 cm long; rachis ca. 15 cm long; bracts ca. 3 mm long; pedicel and ovary 1 cm long. Flowers dense, white to pale yellow, ca. 1.5 cm in diam., not resupinate; dorsal sepal linear-triangular, 1.2 cm long, 3 mm wide, apex obtuse, not contracted at base, 3-5-nerved; lateral sepals obliquely triangular-oblong, 1cm long, 6 mm wide, 5-nerved, apex obtuse, base adnate to foot of column forming distinct mentum; petals linear-lanceolate, more or less recurved, 11 mm long, 2 mm wide, acute; lip articulated with foot of column, ovate-rhomboid, 9 mm long, 6 mm wide, 3-lobed, lateral lobes semioblong, 2.5 mm long, erect and slightly embracing column, terminal lobe ovate-triangular, 3.5 mm long, 3 mm wide, apex obtuse, disc with 3 long keels and usually 2 short keels near apex, keels undulate-cristate, purple toward apex; column 3 mm long, foot 4 mm long; anther 2-celled; pollinia 8, triangular-ovate, in 2 pairs; stigma slightly convex. Fruit ellipsoid, 1.3-1.5 cm long.

TAIPEI: Wulai, Su & Chen 7403; Tungyenshan, Su 385. ILAN: Jinchaoshan, Su 8581. TAICHUNG: Tahsuehshan, Liu & al s. n. Oct 1957; Chiapaotai, Su 8589. NANTOU: Hoshe, Su 57; Salichien, Su 641. KAOHSIUNG: Laonungchi, Su 8113; Sanping, Kuoh 4007. PINGTUNG: Linungshan, Su & Chen 7249; 9199. TAITUNG: Hsingkangshan, Yamamoto s. n. Apr 1930; Su & Chen 7724. HUALIEN: Fonglin, Su 261.

Southern China, Vietnam and the Ryukyus. Taiwan, mostly on rocks and tree trunks in broadleaved forests, 500-1,500 m, throughout.