Plants leafless, holomycotrophic, 20-35 cm tall. Rhizome with many fleshy roots. Peduncle robust, 10-15 cm, glabrous or very sparsely pubescent above, with 3-5 sheaths; sheaths tubular, 2-5 cm, membranous; rachis 6-18 cm, glabrous or sometimes sparsely pubescent, subdensely to densely more than 30-flowered; floral bracts oblong-obovate, 5-7 × ca. 4 mm, lowest (2-)3-10 mm, shorter above, outer surfaces slightly pubescent at base. Flowers relatively large, resupinate, yellowish green or pale green, lip flushed white at margins; pedicel ca. 5 mm, almost glabrous; ovary obovoid, ca. 5 mm, sparsely pubescent; sepals and petals spreading. Dorsal sepal subovate or narrowly elliptic, ca. 5 × 2-3 mm, 1-veined, outer surfaces almost glabrous; lateral sepals falcate, similar to dorsal sepal, but somewhat wider. Petals linear to linear-ligulate, slightly oblique, ca. 4.5 × 1 mm, dilated toward apex, glabrous, 1-veined; lip obovate, 8.5-15 × 6-10 mm, narrowing to ca. 4 mm wide at base, apex deeply 2-lobed; lobes diverging at an acute angle to one another, broadly oblong to subsquare, 2-2.5 × 2-3.5 mm, margins minutely ciliate, apices truncate-rounded and slightly undulate or crenulate; disk with minute papillae. Column slightly arcuate, ca. 4 mm; anther inclined toward rostellum, ca. 0.7 mm; stigma concave, suborbicular, with slightly exserted margins; rostellum subsquare or broadly oblong-ovate, large, ca. 0.7 mm. Fl. Jul-Aug.
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