Epiphytic herbs with elongate, complanate-cylindric, pendulous stems, the lower portions with more or less approximate, elliptic, ancipitous, diphyllous pseudobulbs 3-7 cm. long and 1.5-3 cm. wide inserted at an acute angle, those toward the apex produced at more distant intervals; the internodes and the bases of the pseudobulbs enveloped in the persistent, chartaceous, brown, imbricating bases of the obtuse, foliaceous bracts. Leaves subcoriaceous, linear-lanceolate, obtuse, retuse, or unequally 2-lobed at the apex, 15-30 cm. long and 12-18 mm. wide, the conduplicate bases contracted into very short petioles. Inflorescences short 1-flowered scapes 4-5 cm. long, usually produced in successive pairs from the bract axils of the flush of new growth, each plant thus flowering 3 or 4 times during a given season. Flowers very fragrant, relatively large and conspicuous. Sepals subequal, free, widely spreading, somewhat concave, pure white, elliptic-oblanceolate, acute, 2.5-3.5 cm. long and 1.0-1.4 cm. wide, the laterals adnate at the base to the short column foot, forming an inconspicuous rounded mentum. Petals subequal to the sepals, widely spreading, somewhat concave, pure white, elliptic-oblanceolate, acute, 2.2-3 cm. long and 9-10 mm. wide. Lip white on the outer surface, rich yellow within, with reddish brown or reddish purple transverse lines, conspicuously 3-lobed, 10-12 mm. long and 10-12 mm. wide when spread out, contracted at the base and articulated with the foot of the column, the lateral lobes erect, rounded, the anterior margins obtuse to acute, the mid-lobe acute to suborbicular, more or less canaliculate to spreading, 2/5 to 1/2 the total length of the lip; disk with a linear-lanceolate, concave, yellow callus, 2/3 to 3/4 the length of the lateral lobes, the obscurely tridenticulate apex of which is fleshy and glabrous, the basal 3/4 densely and conspicuously papillose. Column semi-terete, somewhat arcuate, 6-8 mm. long, pure white, with a reddish brown or deep purple blotch at the base.
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