Pseudobulbs stiffly erect, cylindrical, 500–2500 × 30–40 mm, middle slightly swollen, ribbed, dark brownish to blackish, sometimes with purple stripes, upper half leafy. Leaves 6–22, 80–150 × 40–80 mm, leathery, dark green, often concave, notched. Racemes 200–500 mm long, 8–35-flowered. Flowers 50–60 × 50–60 mm, sepals and petals whitish to mauve, petals often with mauve veins, labellum mauve or violet with purple veins and suffusions. Sepals and petals moderately fleshy, widely spreading, twisted. Dorsal sepal 30–40 × 8–12 mm. Lateral sepals 30–40 × 14–18 mm. Petals 35–50 × 4–5 mm. Labellum c. 40 × 40 mm, with 3 dark purple ridges; lateral lobes very large, sometimes wavy; midlobe short, wavy, apex truncate.
Highly localised; found growing on trees and the hard trunks of palms in hot, humid conditions in near-coastal swamps, coastal rainforest and mangroves. In the McIlwraith Ranges it also extends some distance inland into low altitude gorges growing on trees along stream banks.
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