Herbs, epiphytic, monopodial. Stems suberect, short or rather long, noded. Leaves several to many, distichous, flat, sometimes ± conduplicate, leathery, jointed, sessile, often sheathing at base. Inflorescence 1-3, axillary, racemose, lax, often pendulous, many flowered; floral bracts very small, much shorter than pedicel and ovary. Flowers small, often opening widely; lateral sepals adnate to base of lip. Petals smaller than sepals; lip adnate to column base, immovable, saccately spurred at base, indistinctly 3-lobed; lateral lobes erect, small; mid-lobe larger; spur with longitudinal septum inside and often 1 or 2 calli on back wall. Column rather stout, without a foot; rostellum subulate-lanceolate, rather long; pollinia 4, in 2 pairs, equal, ellipsoid-oblong to ovoid, waxy, with short but distinct caudicles, attached by a long, slender, somewhat clavate stipe to a small, ovate viscidium.
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