Rhizome stout, 1-1.3 cm in diam., rigid, densely covered with scaly sheaths, with rather short internodes. Pseudobulbs sparse, usually narrowly ovoid-oblong, 7-11.5 × 1-2.5 cm, with 2 leaves at apex and several sheaths at base; sheaths ovate-lanceolate, 6-9 cm, often fibrously lacerate when old. Leaf blade oblanceolate-oblong or suboblong, 22-28 × 4-6 cm, 5-veined, apex acuminate or shortly cuspidate; petiole (4.5-)6-14 cm. Inflorescence hysteranthous, 20-26 cm; imbricate, convolute, sheathing sterile bracts at interface between peduncle and rachis forming a tube 4-5 cm × 7-8 mm; rachis 9-12-flowered, slightly flexuose; floral bracts deciduous when all flowers opened, broadly ovate-rhombic, slightly conduplicate and cymbiform, 2.5-3 × ca. 2 cm. Flowers white, with brown spots on lip. Sepals narrowly ovate-oblong or suboblong, 33-36 × 8-10 mm, 7-9-veined, acute; lateral sepals often slightly narrower than dorsal sepal. Petals linear-lanceolate, ca. 34 × 2.5 mm, 3-veined; lip subovate, 25-30 × 24-28 mm, 3-lobed; lateral lobes erect, nearly suborbicular; mid-lobe ovate to suboblong, ca. 10 × 7-8 mm, margin long fimbriate; callus with 3 lacerate-fimbriate lamellae extending to middle or near apex of mid-lobe; fimbriate hairs to 2 mm. Column arcuate, 19-22 mm, both sides winged; wings widened from base to apex, upper part 2.5-3 mm wide on one side, apex irregularly finely toothed. Capsule obovoid, ca. 4 × 1.5 cm, slightly 3-ridged. Fl. Sep-Oct. 2n = 40.
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