Epiphytic herbs with many-noded, stem-like rhizomes resembling those of a monopodial orchid. Roots basal. Perennating organ cylindrical or pseudobulbous, fusiform, homoblastic, many-leaved. Leaves linear-lanceolate, acute to acuminate, obscurely pleated, articulated to a sheathing base. Inflorescence lateral, arising opposite leaves in upper part of stem, racemose, simple; bracts persistent. Flowers with pale yellow sepals and petals and a white labellum veined with pink or rose-purple. Dorsal sepal free, lanceolate, acute, suberect with an upcurved tip; lateral sepals oblique at base, otherwise similar to dorsal sepal. Petals free, elliptic-lanceolate, acute, porrect or spreading, shorter and broader than sepals. Labellum free to base of column, trilobed, spurred at base, callose, lateral lobes free to base of column, midlobe fl at; callus two- or three-ridged; spur conical. Column with a foot; anther cap conical, pollinia two, subglobose; stipe solitary, triangular to oblong; viscidium semi-lunate. Ovary cylindrical, grooved. (PC).