Epiphytic or lithophytic herbs. Stem up to 4 cm long. Leaves distichous, oblong or elliptic, sometimes falcate, acute. Inflorescence racemose, few-flowered. Flowers greenish, greenish white or yellow, often marked with red or purple, lasting at least two days. Sepals and petals subequal, not opening widely. Labellum attached broadly at an acute angle to base of column, cymbiform, or deeply concave, fleshy and thick-walled, entire, ecalcarate, ecallose. Column with tooth-like apical appendages, foot absent; anther cap with a porrect beak, pollinia four, in two closely appressed unequal pairs, stipe at least as long as a pollinium, narrow; rostellum porrect.