Epiphytic herbs with more or less thickened, 1-to 2-leaved stems. Sepals free, equal, spreading, linear or linear-lanceolate, often long and acuminate. Petals similar to the sepals. Lip sessile, erect, more or less enfolding the column, base short or long and narrow, expanded into a broad lamina which is plane, rarely concave or somewhat cucullate. Column erect, usually shorter than the claw of the lip, more or less bialate, footless; anther operculate, incumbent, each cell with an obscure longitudinal septum; pollinia 8, 4 in each cell of the anther, broadly ovate and laterally compressed, ceraceous.
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