From the Latin chama, "a gaping mollusk, a cockle," in allusion to the bivalved appearance of the flower.
Plant large, terrestrial, presumably epiphytic, caespitose; roots slender, flexuous. Secondary stems slender, terete, 20-35 cm long, with a tubular sheath low on the stem and another at the base, unifoliate. Leaf erect, coriaceous, ovate, acuminate, acute, tridenticulate, the base deeply cordate, the auricles folded upward, sessile, 8-12 cm long, 5-7 cm wide, the auricles 2-2.5 cm deep. Inflorescence fasciculate, the bilabiate, fleshy flowers produced singly and successively from a spathe 11-13 mm long at the base of the leaf; floral bract 5-6 mm long; pedicel 7-8 mm long; ovary 6-7 mm long; sepals pale yellow-brown, speckled with red, glabrous, but microscopically ciliate, the dorsal sepal broadly elliptical, obtuse, 12 mm long, 8 mm wide, 7-veined, the lateral sepals connate into a transversely ovate lamina, acuminate, obtuse, bidentate, 10 mm long, 11 mm wide; petals maroon, oblong, acute, denticulate, incurved, 8 mm long, 3 mm wide; lip thick, oblong-obovate, obtuse, flat, the margins minutely denticulate, the base shallowly concave or truncate, the disc red-brown and finely verrucose above the middle, with a yellow, elliptical depression to either side of the glenion, 4.5 mm long, 2.5 mm wide; column small, 1 mm long, 2 mm wide.