Herbs, epiphytic. Pseudobulbs borne 3-5 cm apart, arising from base of previous pseudobulb or arising from apex of pseudobulb next to inflorescence, 1-leaved, 2-2.3 cm × 5-6 mm. Leaf 1; petiole 1.7-2.7 cm; blade narrowly elliptic, 8.3-11.5 × 3-4.5 cm, apex acute to subacuminate. Inflorescence terminal, 14.1-17.2 cm, narrowly winged; peduncle 4.1-11.5 cm; rachis ca. 10 cm, laxly 4-6-flowered; floral bracts lanceolate, 5-10.5 mm, apex acute. Flowers green; pedicel and ovary ca. 21 mm, narrowly winged. Dorsal sepal oblong-ligulate, ca. 10 × 3 mm, apex subacute; lateral sepals subfalcate, obliquely oblong-ligulate, ca. 10.5 × 2.5 mm, apex subacute. Petals linear, ca. 11.5 × 1 mm, apex acute; lip suborbicular-rhombic, 10-11 × ca. 10 mm, margin of upper half minutely irregularly erose, callus consisting of a pair of separate, parallel calli obliquely elliptic in side view. Column straight, 4.8-5 mm, upper half with 2 broad-based wings each with a short triangular, subfalcate lobe basally. Fl. Nov.
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