Erect, epiphytic herbs with approximate, linear to oblong-elliptic, ancipitous pseudobulbs 6-15 cm. long and 2-4 cm. wide, the truncate apices usually with 2 or rarely with 3 leaves, the bases of the pseudobulbs enveloped in 4-6 papery, closely imbricating bracts, the uppermost sometimes foliaceous. Leaves ligular to elliptic-oblong, obtuse to shortly acute, coriaceous, 16-27 cm. long and 2.5-6 cm. wide, contracted below into short conduplicate petioles. Inflorescences 1 or 2 arching, unbranched, usually 6-to 12-flowered racemes 15-30 cm. long, produced from the lateral bases of the pseudobulbs, the rachis often dull red, often rather complanate. Flowers large, with conspicuous caudate lateral sepals. Sepals free, spreading, greenish yellow to yellow, usually spotted reddish brown, particularly near the base, the dorsal sepal erect, linear-lanceolate, long-attenuate, 4-9 cm. long and 0.4-0.7 cm. wide, the apical half usually incurving, the lateral sepals conspicuously longer, caudate, of quite variable length, 12-30 cm. long and 0.5-0.6 cm. wide at the base, the outer surfaces with a strongly developed central keel. Petals free, greenish yellow or yellow, usually heavily spotted reddish brown near the base, the long attenuate apices falcately incurving, 2-3 cm. long and 0.3-0.4 cm. wide. Lip entire, oblong-lanceolate, long-acuminate, somewhat convex, often with deflexed lateral margins, yellow with reddish brown markings at the base, 3-5 cm. long and 1.0-1.2 cm. wide, the base sessile and adnate to the base of the column, the disk with 2 erect parallel lamellae in front of which are 2 short, distinct, acute teeth. Column stout, 4-5 mm. long, without wings or appendages, the base without a foot.
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Plants epiphytic, with prominent pseudobulbs, base covered by sheathing bracts, to 50 cm (exclusive of inflorescence). Leaves 1–2 with 1–3 foliaceous bracts; blade 12–40 × 2–8 cm, leathery. Inflorescences to 50 cm; bracts 0.5–1.3 cm. Flowers yellow to yellow-orange or yellow-green with red-brown spots on all perianth parts; sepals 30–200 × 3–6 mm, apex acuminate-setaceous; petals shorter than sepals, 14–37 × 3–5 mm, apex acuminate; lip yellow to yellow-green with several large red-brown spots near lip callus, ovate-lanceolate, 14–27 × 8–14 mm, apex abruptly acuminate; callus of 2 pubescent lamellae, each with distal tooth; column yellow, 2 mm. Capsules 1–15 cm.
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