Herbs, epiphytic. Rhizome erect or pendulous. Pseudobulbs superposed, i.e., each pseudobulb arising near apex of previous pseudobulb, subcylindric, 2-leaved. Leaves petiolate, plicate, linear to elliptic, papery, acute. Inflorescence proteranthous or synanthous, pendulous, racemose, many flowered; rachis straight or weakly zigzag; floral bracts caducous at or after anthesis. Flowers resupinate, often white, with or without brown markings, or flesh-colored, small. Sepals free, narrowly lanceolate to linear-lanceolate. Petals linear-lanceolate to linear; lip with a saccate, bilobed hypochile and a much longer, narrow epichile, ecallose; lateral lobes of hypochile clasping base of column. Column incurved and dilated apically, without stelidia, foot absent; pollinia 4, with caudicles; stigma cup-shaped; rostellum large. Capsule ellipsoid, rostrate.
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