Epiphytic herbs. Roots terete, not or sparsely branching, glabrous, smooth. Stem patent, rooting in basal part. Leaves conduplicate, articulate, distichous, narrowly oblong to linear, straight to subfalcate, twisted at base so as to lie in one plane with stem, often tinged red-purple, apex asymmetric, bilobed with obtuse lobes, margins smooth. Inflorescence lateral, almost wiry, solitary, erect, patent or pendent, racemose, many-flowered; peduncle much shorter than rachis. Flowers resupinate, c. 0.5 cm wide, ephemeral, opening simultaneously, quaquaversal, pale yellow or whitish, sometimes tinged purple. Sepals entire, free or shortly connate at base, linear to ovate, obtuse. Petals similar to sepals. Labellum hinged with apex of column foot, not spurred, not fleshy, often folded lengthwise, sometimes with a basal callus, entire or trilobed, the midlobe, if present, laterally flattened. Column semiterete, column foot distinct, as long as column or longer; anther cucullate, pollinia four, in two, subglobose, unequal pairs, stipe about as long as pollinia, linear to spatulate, viscidium rounded.