Plants epiphytic, lithophytic, or sometimes terrestrial, cespitose, to 3 m. Stems: pseudobulbs laterally compressed, 1–2 cm. Leaves from apex of pseudobulb, green, sometimes spotted or suffused with purple, elliptic to ovate-lanceolate, 10–85 × 5–12 cm, margins entire. Inflorescences arcuate-pendent, 0.8–3 m (including peduncle); peduncle terete, 3.5–8 mm diam.; bracts distant, tubular sheaths, 6–15 mm, scarious; panicles open, branches few-to several-flowered, 1–42 cm; floral bracts linear-lanceolate, 3–5(–10) mm, scarious. Flowers yellow (infrequently brown to green) with reddish brown blotchy spots or not, fragrant or odorless; sepals clawed, margins undulate; dorsal sepal suborbiculate, rounded, 180–190 × 9–11 mm; lateral sepals broadly elliptic, 16–17 × 6–7 mm; petals clawed, broadly elliptic, 16–20 × 8–11 mm, margins undulate, apex obtuse; lip 3-lobed, pandurate, 16–19 mm, middle lobe ± reniform, 18–22 mm wide, margins undulate, apex retuse, lateral lobes basal, spreading, appearing auriculate, small, margins recurved, apex retuse; disc red with prominent, yellow, multi-horned callus composed of 2 pairs of tuberculate protuberances separated by lobed median ridge; column erect, white, wings prominent, 5–6 × 7 mm; ovary 24–30 mm. Capsules pendent, green, ellipsoid, 30–60 × 15–20 mm. 2n = 32.
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