Herbs, terrestrial, small, holomycotrophic. Rhizome narrowly fusiform, tuberous, fleshy, neck sometimes with a few filiform roots. Stem erect, slender, with a few scalelike sheaths, leafless, glabrous. Inflorescence erect, terminal, racemose, with 1 to several flowers; rachis congested, sometimes thickened; floral bracts very small. Flowers erect or spreading, resupinate, often ephemeral, white or pale yellowish brown, small; pedicel elongating in fruit. Sepals and petals connate at base and forming a short tube; dorsal sepal and petals connate for ca. 1/2 their length and forming a porrect hood; lateral sepals usually connate for more than 1/2 of their length, deflexed or weakly spreading; lip adnate with column at base, free from sepals and petals, not spurred, apex entire or weakly 3-lobed; disk with a 2-lobed gland at base and sometimes papillate usually with callus. Column elongate, dilated and with 2 wings at apex, wings attenuate into decurved, filiform stelidia on either side of stigma, lacking a column foot; anther terminal, borne on a long filament; pollinia 4, in 2 pairs, granular-farinaceous, ecaudiculate, each pair directly attached to a sticky viscidium; rostellum erect, transverse, small; stigma broad, placed directly below rostellum. Capsule erect, fusiform.
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