Erect, caespitose, epiphytic herbs, up to about 38 cm. tall. Pseudobulbs complanate-cylindric, monophyllous, 4-5.5 cm. long and .5-1.0 cm. wide, the bases enveloped in several imbricating, sometimes foliaceous bracts. Leaves coriaceous, persistent, lanceolate, acute, 15-35 cm. long and 2.5-4.5 cm. wide, contracted below into an elongate, conduplicate petiole which is apparently continuous with the apex of the narrow pseudobulb. Inflorescences few to many erect 1-flowered scapes, 7-12 cm. tall, produced from the bases of the pseudobulbs, enveloped throughout in tubular, acuminate, papery bracts. Flowers relatively large and conspicuous. Sepals free, subequal, spreading, greenish yellow, linear-lanceolate, attenuate, 5-7.5 cm. long and .5-.6 cm. wide, the oblique bases of the laterals adnate to the column foot, forming a conspicuous acute mentum. Petals subequal to the sepals, white, erect with incurving apices, linear-lanceolate, long-acuminate, 5-6 cm. long and .4-.5 cm. wide. Lip concave, slightly arcuate, nearly entire but obscurely 3-lobed near the apex, clear yellow, oblong-ovate when spread out, 1.5-2 cm. long and .9-1.1 cm. wide, the base articulated with the foot of the column, the lateral margins erect, the apices bluntly acute, the obtuse mid-lobe somewhat thickened, with a fleshy callus on the under-side of the apex; disk with a fairly prominent, fleshy, slightly concave, linguiform callus about half the length of the lateral margins. Column short, stout, semi-terete, 6-7 mm. long, produced at the base into a very conspicuous foot which is about twice the length of the upper column.
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