Pseudobulbs close, dark green to purple, broadly ovoid, to 4 cm in diam. Leaf blade oblong or narrowly elliptic, plicate, ca. 50 × 3 cm, with long petiole at base, apex long acuminate. Inflorescence erect; peduncle purplish in lower part, to 73 cm, ca. 4 mm in diam., with 3 or 4 sheaths; rachis laxly 9-or 10-flowered; floral bracts yellowish green, narrowly lanceolate, 1-1.5 cm, long acuminate. Flowers opening widely, brownish green or purplish brown, lip and column white, anther cap with 2 purple spots at apex; pedicel and ovary ca. 2 cm. Sepals similar, oblong, 20-22 × ca. 5 mm, acute and aristate; lateral sepals sometimes with midvein extending keel-like beyond tip abaxially, base mostly adnate to column foot. Petals similar to sepals, and smaller, acute and aristate; lip obovate, ca. 14 × 8-9 mm, 3-lobed; lateral lobes erect, ovate-oblong, obtuse; mid-lobe orbicular, base without conspicuous claw, mucronate; disk with 3-5 lamellae extending to mid-lobe and becoming 5-undulate or crestlike there; spur extending beyond 2 lateral sepals, saccate-conic, ca. 4 mm, obtuse. Column subcylindric, ca. 9 mm; rostellum broadly triangular, fleshy, obtuse. Fl. Apr-May. 2n = 40.
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