Erect or scandent epiphytic herbs, perhaps up to a meter or more long. Stems slender, simple or branched, covered with the leaf-sheaths, becoming naked with age. Leaves 1-12 cm. long and 0.2-1.5 cm. broad, linear to lanceolate to oblong-elliptic, obtuse and the apex usually unequally bilobed. Inflorescence short and few-to several-flowered from a fractiflex raceme; bracts scarious, conspicuous; flowers small, variable in size. Sepals 4.5-13 mm. long and 1.5-3 mm. broad, linear-lanceolate to elliptic-oblong, occasionally carinate dorsally. Petals 4.5-13 mm. long and 0.8-2.3 mm. broad, linear to linear-spatulate, acute or obtuse. Lip unguiculate; claw adnate to the column; lamina 4-9 mm. long and 2-5 mm. broad, simple or subtrilobate, triangular-cordate to lanceolate-cordate, acute or obtuse, provided with a longitudinal callus which is bifurcate at the base.
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