Erect, epiphytic herbs with slender brown, compressed pseudobulbs, more or less linear in outline but usually somewhat broader at the base and tapering grad-ually to a narrower apex, 6-12 cm. tall and 1.5-3 cm. wide at the base, terminating above in 1 or 2 leaves, the base enveloped in several distichously imbricating bracts, the uppermost 2 or 3 of which are conspicuously foliaceous. Leaves ligular, obtuse, coriaceous, 15-45 cm. long and 2-3.2 cm. wide, contracted below into elongate, slender, conduplicate petioles. Inflorescences 1 or 2 erect or arching panicles much exceeding the leaves, up to about 1 m. in length, the lateral branches short, usually 3-flowered, provided with several conspicuous, elongate, acute, pale brown, spath-aceous bracts. Flowers of moderate size, the sepals and petals greenish; yellow or yellow, heavily blotched and spotted dark brown or maroon, the apical and lateral lobes of the lip bright yellow, the central isthmus brown or maroon. Sepals sub-equal, free, spreading, with undulate margins, the dorsal sepal oblong-lanceolate, acute, 10-15 mm. long and 3.5-5 mm. wide, the lateral sepals linear-lanceolate, obliquely acute, with a distinct central keel on the dorsal surface, 12-17 mm. long and 2.5-4.5 mm. wide. Petals subequal to the dorsal sepal, elliptic-lanceolate, acute, with undulate margins, 10-15 mm. long and 4-6 mm. wide. Lip panduri-form, with a broad central isthmus, 12-15 mm. long and 10-12 mm. wide at the 2-lobed emarginate apex, the base with 2 small, suborbicular, lateral auricles, the disk with an erect, more or less triangular, multidenticulate callus. Column 5-6 mm. long, with narrow lateral wings, the base without a foot.
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