Epiphytic herbs. Stem suberect. Leaves several to many, distichous, coriaceous, articulate to a sheathing base, deciduous, duplicate. Inflorescences lateral, racemose, many-flowered, often pendent; peduncle and rachis sometimes glandular-pubescent; floral bracts shorter than ovary and pedicel. Flowers resupinate, often widely opening. Sepals and petals spreading. Lateral sepals adnate to base of labellum. Petals smaller than sepals. Labellum rigidly fused to column base, saccately spurred at base, indistinctly trilobed, side lobes erect, midlobe larger; spur with longitudinal septum inside and often one or two calli on back wall. Column erect, foot absent; pollinia four, arranged in two nearly equal pairs, ellipsoid-oblong to ovoid, waxy, with short but distinct caudicles, attached by a clavate stipe to an ovate viscidium; rostellum subulate-lanceolate, porrect.