Leaves 30–60 × 10–25 mm. Flower stem 15–40 mm long. Flower obliquely erect to stiffly erect, 15–24 × 25–30 mm, green to purplish brown with greenish to black labellum calli. Dorsal sepal 15–24 × 8–11 mm; apical club 1–3 mm long. Lateral sepals projecting forwards beneath labellum, 15–20 × 2–2.5 mm; apical clubs 2–3 mm long. Petals incurved near column, 15–20 × 4–6 mm, curved. Labellum nearly horizontal, broadly ovate to heart-shaped, 12–15 × 9–13 mm, margins pale. Calli central; three basal calli column-like, crowded, one larger than others; two rows of thin, column-like calli; distal gland anvil-like. Column 15–16 × 5–7 mm.