Plants lithophytic or terrestrial, autotrophic. Pseudobulbs usually somewhat tufted, cylindric to narrowly fusiform, usually tapering toward apex, slightly bilaterally flattened, 2-7(-15) × 0.5-1(-1.5) cm, several noded, naked. Leaves 2-4, borne at apex of pseudobulbs, oblanceolate-oblong to narrowly elliptic, 6-17(-25) × 1.9-4(-6) cm, base contracted into a petiole-like stalk, apical margin finely toothed, apex acuminate; petiole-like stalk 3-18 cm, articulate. Inflorescence lateral, arising from an intermediate node of pseudobulb, erect, 8-20 cm or longer; rachis (1 or)2-6-flowered; floral bracts lanceolate, 10-15 mm. Flowers usually not scented, 2-2.5 cm in diam.; pedicel and ovary 20-25 mm; sepals and petals white or pale green, midvein sometimes purplish brown; lip white or pale green with purplish brown markings. Sepals oblanceolate-oblong, 22-27(-30) × 5-7 mm, apex acute. Petals suboblong, 15-23 × 5-7 mm, apex acute; lip ovate-oblong, 15-20 mm, not fused to basal margins of column, obscurely 3-lobed; lateral lobes erect and loosely clasping column; mid-lobe recurved, broadly ovate, 6-11 × 6-12 mm; disk with 2 longitudinal lamellae extending from base of lip to base of mid-lobe; lamellae convergent toward their apices and forming a short tube. Column ca. 15 mm; pollinia 4, in 2 pairs. Capsule narrowly ellipsoid, ca. 50 × 15 mm. Fl. May-Aug, fr. Oct-Dec. 2n = 38*, 39, 40, 42.
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