Epiphytic herbs. Stem ascending or pendent, enclosed in basal sheaths of leaves. Leaves usually distichously arranged, narrowly elliptic or strap-shaped, margin sometimes undulate, apex unequally bilobed, acute or rarely with three setae, slightly coriaceous, flat, articulate to an amplexicaul-sheathing base, sometimes twisted at base and lying in one plane. Inflorescence lateral, racemose, often dense and appearing subumbellate, few to many-flowered. Flowers resupinate or with the labellum pointing toward the axis. Sepals and petals free, similar, spreading. Labellum firmly attached to base of column, divided into a semi-globose to saccate or conical hypochile with side lobes reduced to edges of the sac, and a flabellate, often broadly triangular, often hairy or papillose epichile, margin entire to fimbriate. Column foot absent; anther operculate, semi-globose, apex narrower than base, pollinia two, waxy, subglobular, porate or rarely cleft, or rarely four, solid, attached by a common, longer-than-wide stipe to a bilobed viscidium; rostellum bilobed.