Herbs, epiphytic or lithophytic. Rhizome creeping. Pseudobulbs close together, narrowly ovoid-ellipsoid, usually covered by many sheaths, apex 2-leaved. Leaves petiolate, linear-lanceolate to lanceolate, plicate, papery, acuminate. Inflorescence synanthous, pendulous, racemose, 10-20-flowered, flowers in apical part opening first; rachis zigzag; floral bracts caducous after anthesis, partly covering flowers, membranous. Flowers distichous, white, part of lip and column reddish brown, resupinate. Sepals free, ovate to ovate-lanceolate, lateral sepals oblique. Petals obliquely and narrowly oblong; lip spurred at base, curved, entire, ecallose, constricted near middle, apical part suborbicular-reniform; spur incurved, tubular. Column dilated apically, without stelidia, foot absent; pollinia 4, ellipsoid-obovoid, with caudicles. Capsule ellipsoid.
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