Epiphytic or lithophytic herbs. Roots stout, basal. Stem covered in sheathing leaf bases. Leaves pendent, semi-terete, sulcate, articulate to sheathing base. Inflorescence axillary, elongate, pendent to suberect, racemose, multiflowered, borne toward basal part of stem below leaves. Flowers resupinate, whitish with purple labellum. Sepals and petals free, subequal or petals smaller, spreading or reflexed. Labellum attached to column base, trilobed, side lobes horn-like, midlobe prominent, flat, callus keeled; spur laterally compressed, semi-lunate from the side, obtuse, callose within. Column fleshy, dilated toward base, clinandrium dorsal; pollinia two, sulcate, stipe linear-spatulate, viscidium prominent; rostellum erect, crest-shaped, bidentate. Capsule fusiform-clavate.