Caespitose or repent epiphytic or terrestrial herbs. Secondary stems very short, unifoliate. Leaves mostly broadest near the apex and attenuated into a petiole at the base. Inflorescence a distichous raceme. Sepals connate at the bases; the dorsal sepal free or nearly so, sometimes caudate; lateral sepals more or less united, usually forming a cymbiform synsepal, often callus-thickened near the apices, the apices often attenuated into tails. Petals much shorter than the sepals. Lip small, articulated to the column-foot. Column erect, produced into a foot at the base; margins of the clinandrium membranaceous and denticulate. Anther terminal, operculate, incumbent; pollinia 2, ceraceous.
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