形态特征：Terrestrial, leafless, achlorophyllous herbs. Roots few, slender, 1–13 cm long, ca. 0.5–0.7 mm in diameter. Rhizome fleshy, tuberous, fusiform, 20–50 mm long, 5–12 mm in diameter, grayish brown, finely irregularly verrucose, scaly. Scales verticillate, oblong-lanceolate, brownish black, ca. 2 mm long. Inflorescence erect, terminal, 1.0–8.5 cm long, ca. 3 mm in diameter, white to pale whitish, peduncle 1–4 noded; sheath membranous, ovate to broadly ovate, 3–5 × 2–3 mm; rachis often less than 5 mm long. Bracts membranous, ovate to ovate-oblong, apex pointed, pale yellowish-brown, 3.0–5.0 × 2.0–2.5 mm. Ovary 3–7 mm long, 1.5–3.5 mm in diameter. Flowers (1–)2–5(–8), erect, bell-shaped, slightly curved, not opening widely, 9–11 mm long, 5–7 mm in diameter. Tepals united, forming a 5–lobed tube, 9–11 mm long, slightly verrucose apically, otherwise smooth. Sepals similar, fleshy, thickened, lateral sepals fused to 1⁄2 their length, whitish, apex with sparse pale yellowish spots; free lobe of dorsal sepal broadly ovate, ca. 1.5–2.0 × 3.0–3.5 mm; free lobes of lateral sepals ovate, ca. 1.5 × 2.0 mm, each bearing a pale yellowish thickened callus inside. Petals whitish on both sides, unthickened, fleshy, thin, triangular-ovate, 0.8–1.0 × 0.6–0.8 mm. Lip free from perianth tube, adnate to column foot, pale-green tinged yellow at base and reddish-brown apically and marginally, 3.5–4.5 ×2.0–2.5 mm; hypochile with two whitish, globose, subsessile, nectarless calli, ca. 1 mm in diameter; epichile rhombate-ovate, 6–7 nerved, rounded at base, entire, disc thickened and distinctly 2- ridged in the middle, ridges much raised and tinged yellowish near apex. Column white, straight, 4.0–4.5 × 1.5–1.8 mm, base with short foot, apex with a pair of lateral wings; lateral wings with acuminate tips superior to anther; rostellum well developed, 0.2 × 1.5 mm; stigma located near base. Anther hemispherical, 0.6–0.7 mm in diameter; pollinia 2. Capsule ellipsoid, 1.5–2.0 cm long, 0.5–0.8 cm in diameter; pedicel elongating to 8–20 cm long in fruit. Seeds fusiform, 1.6–2.2 mm long.
