Plants epiphytic, autotrophic. Pseudobulbs nearly fusiform or ovoid-globose, bilaterally flattened, 4-8 × 2.5-3.5 cm, enclosed in leaf bases, produced every 2 or 3 years (not annually). Leaves 6-11(-17), lorate, 57-65 × 1.4-2.1 cm, articulate 4-8 cm from base, base distichous-equitant and with brown membranous margins 1-1.5 mm wide, apex acute and slightly 2-lobed, sometimes with a minute mucro in sinus. Inflorescence arising from leaf axils, erect or suberect, 25-40 cm; rachis 1-or rarely 2(or 3)-flowered; floral bracts ovate-triangular, 6-7 mm. Flower slightly fragrant, rather large, 8-12 cm in diam.; pedicel and ovary 25-35 mm; sepals and petals white, sometimes slightly tinged pink; lip white with a central yellow patch and sometimes mottled purplish pink on lateral lobes and mid-lobe, lamellae yellow; column white, sometimes tinged pale pink, sometimes with yellow spots at base. Sepals oblong-obovate, 55-70 × 15-20 mm, apex often subobtuse. Petals narrowly obovate, 55-70 × 13-18 mm, apex acute; lip broadly elliptic, slightly shorter than sepals, base fused to basal margins of column for 3-5 mm, 3-lobed; lateral lobes erect, loosely clasping column, not ciliate; mid-lobe slightly recurved, ovate-triangular, margin undulate; disk papillate or puberulent, with a densely hairy patch on basal half of mid-lobe, with 2 converging lamellae extending from base of lip to near base of mid-lobe. Column 35-45 mm, narrowly winged, subglabrous; pollinia 2, subsquare; viscidium with filiform appendages at base. Capsule subellipsoid, 50-70(-100) × 30-40 mm.
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