Pseudobulbs brown when dry, cylindric, 1.5-3 cm × 2.5-3.5 mm, longitudinally wrinkled when dry, apically ± hook-shaped. Leaf suberect, lanceolate-elliptic, 4-7 × 1.2-1.5 cm, thinly leathery, obtuse; petiole 1-2 cm. Inflorescence 5-7 cm; floral bracts ovate, 5-7 mm, membranous. Flower solitary, white, lip with 2 purple spots at base and with a yellow blotch at base of mid-lobe; pedicel and ovary 1-2 cm. Sepals linear-lanceolate, 28-32 × 3-3.5 mm; lateral sepals with basal pouch ca. 3 mm. Petals linear, ca. 30 × 2.5 mm; lip narrowly obovate, ca. 30 × 8 mm, attenuate toward base, base spurred, distally 3-lobed and slightly shoulderlike; lateral lobes small; mid-lobe subquadrate, slightly undulate, apex slightly emarginate and apiculate; spur ca. 3 × 1.5 mm. Column ca. 2.5 cm; wing ca. 2.5 mm wide on each apical side. Capsule ellipsoid, 1.6-2 cm × 7-9 mm. Fl. May-Jun, fr. Jul-Aug.
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