Epiphytic orchids with large thick pseudobulbs covered with thin papery sheaths and thin wiry roots that form an intricate network. Leaves 2 to 4 per stem, relatively long, flat, arising from terminal nodes. Inflorescence racemose, stiffly erect, arising from upper nodes of pseudobulbs. Flowers resupinate, generally small, cupped, externally hairy. Dorsal sepal free. Bases of lateral sepals fused to both column and column foot. Labellum stiffly attached to apex of column foot. Labellum lamina 3-lobed, with small basal spur. Callus with ridges or keels.