Rhizome ca. 8 mm in diam. Pseudobulbs borne 1-2 cm apart, dark brown when dried, narrowly ovoid to subcylindric, 9-15 × 1-2 cm, base slightly contracted. Leaves narrowly elliptic-oblanceolate, 30-44 × 4-8 cm, acuminate; petiole 4-5 cm. Peduncle 10-20 cm, continuously elongating at fruiting; rachis straight or sometimes slightly flexuous, 7-13 cm, several to 10-flowered; floral bracts broadly ovate-elliptic to suborbicular, 2-4 × 1.5-2.8 cm, thinly membranous, obtuse. Flowers white, keels yellow; pedicel and ovary 1.5-1.8 cm. Sepals suboblong, 40-45 × ca. 10 mm, abaxially carinate, basal sac ca. 4 mm deep; lateral sepals with deeper basal sac. Petals linear, 40-45 × 3-4 mm; lip obovate, 4-4.5 × ca. 2.5 cm, distally 3-lobed; lateral lobes subovate, obtuse-rounded; mid-lobe subreniform, margin ± erose; disk with 2 or rarely 3 longitudinal lamellae extending from base to base of mid-lobe, occasionally with 5 lamellae at base; basal sac 4-5 mm deep. Column ca. 3.5 mm. Capsule obovoid-ellipsoid, ca. 3.5 × 2 cm, wing-shaped ribs ca. 3 mm wide. Fl. Nov-Jan.
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