Epiphytic or lithophytic herbs. Roots terete, not or sparsely branching, glabrous, smooth. Stem to more than 3 m tall, erect or overhanging with apical part erect, leafy, rooting along its length. Leaves conduplicate, articulate, distichous, oblong to linearoblong, not twisted at base, coriaceous, apex rounded to emarginate or unequally bilobed with rounded lobes, margins entire. Inflorescences lateral, arising near apex of stem, solitary, erect, paniculate with up to two levels of branching, many-flowered, bracts subtending branches relatively large and broad; floral bracts similar but smaller, patent, yellowish. Flowers resupinate, 2–3 cm in diameter, quaquaversal, usually yellowish with brown spots. Sepals free, oblong to obovate, margins entire. Petals obovate. Labellum rigidly attached to column, not spurred, trilobed, divided into a concave hypochile with the lateral lobes and a flat epichile at right angles or at a sharp angle to the hypochile (the labellum knee-like bent in lateral view), hypochile with a central, cushion-like, laterally flattened callus, epichile with two calli, one basally and one just below midlobe, which forms apical part of epichile. Column lacking a foot; anther cucullate, pollinia four, cohering closely in two bodies, those in each body unequal, stipe linear, about as long as pollinia, viscidium broadly oblong; rostellum bidentate after removal of pollinarium. Capsule oblong.