Rhizome creeping, slender, 1.5-2.5 mm in diam., internodes 3-7 mm. Pseudobulbs 2-4.5(-8) cm apart on rhizome, not lucid when dried, narrowly ovoid to nearly cylindric, 2-3(-4.5) cm × 5-15 mm, with 2 leaves at apex and 2 or 3 sheaths at base; sheaths ovate, 1-2 cm, deciduous when old. 

Leaf blade oblong or oblong-lanceolate, 4-10 × 1-2 cm, papery, apex acute; petiole 1-1.5(-2) cm.

Inflorescence heteranthous; peduncle 5-10 cm, base covered with several tubular sheaths; sheaths equitant, closely embracing inflorescence; rachis often with 1 or 2 flowers opening successively, apex of rachis enclosed in several white bracts; floral bracts caducous; pedicel and ovary 1-1.2 cm. Flowers pale yellow or nearly white, only with red stripes on lip. Sepals oblong-lanceolate, 16-20 × 4-7 mm. Petals filiform or narrowly linear, 16-20 × 0.7-1 mm; lip ovate, 13-18 mm, 3-lobed; lateral lobes erect, subovate; mid-lobe nearly elliptic, 5-7 × 5-6 mm, margin fimbriate, apex obtuse; callus with 2 irregularly undulate lamellae extending from base to near apex of mid-lobe and between them at base of callus with 1 short lamella, sometimes a further 2 much shorter lamellae outside others on mid-lobe. Column slightly arcuate, 10-13 mm, both sides with wings; wings widened toward column apex, one side 1-1.3 mm wide, apex irregularly incised or dentate.

Capsule obovoid, 1.8-2 × ca. 1 cm; fruiting pedicel 6-7 mm. Fl. Aug-Oct, fr. next Apr-Aug. 2n = 40, 40 + 2f.