Herbs, epiphytic, rather tall and large. Pseudobulbs densely arranged, suboblong, 2-3.5 cm × 6-15 mm. Leaves 2; petiole 4-17 cm, articulate; blade oblanceolate or linear-oblanceolate, 16-46 × 1.7-3.5 cm, papery, apex acuminate. Inflorescence 16-45 cm; peduncle compressed cylindric, both sides with wings 1-2 mm wide, upper portion with 1 or 2 subulate sterile bracts; rachis 8-22 cm, more than 10-flowered; floral bracts subulate, 5-10(-12) mm. Flowers greenish yellow; pedicel and ovary 7-11 mm. Sepals narrowly obovate or oblong to oblong-obovate, 4-4.5 × 1.5-1.8 mm, margin revolute, apex obtuse; lateral sepals often slightly wider than dorsal sepal. Petals nearly filiform, 4-4.5 × ca. 0.5 mm, slightly widened toward apex; lip flabellate, 4-4.5 × 5-6 mm, with an oblate basal callus, apical margin irregularly serrulate, apex subtruncate and mucronate; callus running forward becoming a broad, short and stout midvein. Column suberect or slightly arcuate, 3-3.5 mm, slender, base slightly dilated, apex with narrow wings. Capsule obovoid-ellipsoid, 7-8 × ca. 5 mm; fruiting pedicel 3-5 mm. Fl. Oct-Jan, fr. Apr-May. 2n = 76.
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