Epiphytic herbs. Stem few-leaved. Leaves distichously arranged, ligulate, flat, unequally bilobed, with sheathing base, articulate, duplicate. Inflorescence arising from lower portion of stem, axillary, pendent, branched or unbranched, many-flowered. Flowers resupinate. Sepals and petals free, similar. Petals usually smaller and narrower than sepals. Labellum rigidly adnate at base to column, spurred, trilobed, lateral lobes suberect; spur subconical, inside septate and with a callus on back wall. Column without foot; clinandrium low; anther cap semi-globose, apex beaked, pollinia four, appearing as two almost equal pollen masses, waxy, compressed-globular, separate, each attached to a common long stipe through a caudicle at a right angle, viscidium ovate; stigma suborbicular; rostellum raised, laterally compressed, helmet-like in side view, with a longitudinal furrow along its edge into which stipe and dorsally positioned pollinia recline.