Description from Flora of China
Saccolabium acuminatum (Lindley) J. D. Hooker.
Stems often arching, terete, 5-27 cm, slender, 3-4 mm in diam., many noded, internodes 1-2 cm. Leaf blade lanceolate or obliquely oblong, 4-10.5 × 0.7-1.5 cm, acute and slightly praemorse. Inflorescence arching, 7-10 cm, densely many flowered; floral bracts ovate, 3-6 mm. Flowers not opening widely, yellowish green, slightly fleshy; pedicel and ovary 5-7 mm. Sepals cymbiform, broadly ovate, 6-7 × ca. 5 mm, obtuse. Petals ovate, ca. 6 × 4 mm, obtuse; lip with a long spur at base, 3-lobed; lateral lobes erect, suborbicular, large, 5-6 mm wide; mid-lobe ovate-triangular, very small, fleshy, adaxially shallowly concave, apex obtuse; spur funnel-shaped, strongly curved forward and hooked, ca. 15 mm. Column ca. 3 mm; rostellum large, fleshy; anther cap subconic; stipe ca. 3 mm; viscidium oblong, ca. 3 mm. Fl. Apr-Jul.
Epiphytic on tree trunks in dense forests; 1300-1900 m. Guizhou, S Yunnan [Bhutan, NE India, Nepal].