Epiphytic herbs with elliptic-ovate to elliptic-oblong, compressed, monophyllous pseudobulbs 3.5-6 cm. long and 1.5-4 cm. wide, the internodes of the mature plants 6-8 cm. long and 8-12 mm. thick, enveloped in closely imbricating, tubular, acute, papery bracts, the upper 3-6 of which are complanate-spathaceous, the conduplicate bases covering the lower half of the pseudobulb. Leaves coriaceous, ligular to elliptic-lanceolate, acute, 15-35 cm. long and 3-6 cm. wide, contracted below into narrow, conduplicate petioles. Inflorescences usually 2-4 slender 1-flowered scapes, 4-5 cm. long, produced from the axils of the spathaceous, sheathing bracts after the current pseudobulb has nearly matured. Flowers relatively large and conspicuous. Sepals subequal, free, not spreading, concave, the dorsal sepal lanceolate, acute, 3-3.5 cm. long and .8-1.0 cm. wide, the laterals elliptic-lanceolate, acute, 3-3.5 cm. long and 1.0-1.2 cm. wide, adnate to the foot of the column, forming an inconspicuous, rounded mentum. Petals white, lanceolate, acute, 2.8-3.2 cm. long and .6-.7 cm. wide. Lip conspicuously 3-lobed, white, 18-20 mm. long and 18-20 mm. wide when spread out, contracted at the base and articulated with the foot of the column, the lateral lobes erect and incurving over the column in natural position, the acute apices projecting, the mid-lobe triangular, acute, about the total length of the lip; the disk with a short, fleshy, ligular, obtuse callus about 3/4 the length of the lateral lobes, the basal half yellow, densely and conspicuously pilose. Column semi-terete, somewhat arcuate, 10-12 mm. long, produced at the base into a short foot.
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