Rhizome creeping, relatively long, ca. 3 mm in diam., internodes 1-2.4 cm. Pseudobulbs 8-13 cm apart on rhizome, not lucid when dried, nearly cylindric, 3-6 cm × 6-8 mm, with 2 leaves at apex and 2 sheaths at base; sheaths ca. 3 cm, membranous, deciduous when old. Leaf blade lanceolate, oblong-lanceolate, or ovate-lanceolate, 6-12 × 2-3.7 cm, papery, apex acuminate or obtuse; petiole 5-10 cm. Inflorescence heteranthous; peduncle 5-8 cm, base covered with several equitant tubular sheaths; rachis often with 1 or 2 or rarely to 3 or 4 flowers opening successively, apex of rachis enclosed in several white bracts; floral bracts caducous; pedicel and ovary 6-10 mm. Flowers greenish yellow, with purplish red stripes on lip. Sepals oblong-lanceolate, ca. 20 × 5-6 mm. Petals filiform or narrowly linear, nearly as long as sepals, ca. 1 mm wide; lip suboblong-ovate, ca. 20 × 15 mm, 3-lobed; lateral lobes erect, subovate; mid-lobe elliptic, ca. 10 × 9 mm, fimbriate at margin; callus with 3 longitudinal lamellae, of which purple inner 2 extending from its middle or near apex to base of disk, median lamella indistinct, sometimes a further 2 much shorter lamellae outside others on mid-lobe. Column slightly arching, ca. 13 mm, both sides with wings; wings widened toward column apex, apex obtuse; anther ca. 2.5 mm; rostellum ca. 2 mm. Capsule subobovoid, ca. 2.5 × 1.2 cm; fruiting pedicel ca. 5 mm. Fl. Aug-Nov, fr. next Sep. 2n = 40, 80.
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