Epiphytic herbs with erect, elongate, semiterete pseudobulbs 10-27 cm. long and .4-1.2 cm. wide, the bases enveloped in 3-4 brown, papery, imbricating bracts, the apices with 2 lanceolate or elliptic-lanceolate, plicate, strongly veined, acute or acuminate leaves 15-36 cm. long and 2.5-9 cm. wide. Inflorescences erect, slender racemes 10-15 cm. long, produced from the base of the pseudobulbs, the lower portion below the flowers enveloped in several broad, papery, closely imbricating bracts. Flowers few to many, comparatively large, on short pedicels. Sepals membranaceous, white or pale yellow, spreading, subequal, the dorsal sepal free, lanceolate, acute or acuminate, 15-25 mm. long and 4-7 mm. broad, lateral sepals adnate at the base to the column foot, forming a short mentum, somewhat obliquely lanceolate, acuminate, with a strong central keel on the dorsal surface, 15-30 mm. long and 4-8 mm. wide. Petals membranaceous, white or pale yellow, spreading, subequal to the dorsal sepal, lanceolate, acuminate, 15-20 mm. long and 4-7 mm. wide. Lip 3-lobed, articulated at the base with the foot of the column, 14-18 mm. long and 4-8 mm. broad, white or pale yellow, with purple or maroon stripes, lateral lobes conspicuous, erect, about equaling the column, apical lobe densely papillose, the lateral margins strongly inflexed; disk with 5 thickened cen-tral nerves or lamellae. Column short, stout, terete, produced at the base into a long broad foot. Anther terminal, operculate, incumbent, 1-celled; pollinia 4, waxy.
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