Terrestrial or rarely epilithic,deciduous,glabrous. Stem 19-40 cm tall.

 Leaves 4-5,cauline,spreading,lanceolate,acute or acuminate,mucronate,8-15 cm long,2-2.5 cm wide.

 Inflorescences lax,few flowered;rachis 3-4 cm long;infertile bracts foliaceous,1-3,erect,lanceolate-ovate,acuminate,3-4.4 cm long;fertile bracts narrowly lanceolate,acuminate,1.5-2.5 cm long,3mm wide. Flowers white with green sepals and petals,lip often with some red patches at the base. Ovary(including pedicel)2-4 cm long. Sepals acute,3-veined;dorsal sepal erect,ovate,8-8.5 mm long,and 4-4.2 mm wide;lateral sepals spreading to somewhat reflexed,obliquely ovate,7.5-11.5 mm long,4.75-4.9 mm wide,basally united with the lip. Petals erect,forming a hood with the dorsal sepal,linear,acute or obtuse,1-veined,7-8 mm long,0.5-1 mm wide. Lip 18-25 mm long,deeply 3-lobed above basal united part of 4.5-7 mm;1 middle lobe linear-oblong,very convex,4-8 mm long,0.7-1 mm wide;side-lobes 13-23 mm long,divided into 15-17 filiform laciniae;lacinia 11.5-20 mm long,0.25-0.3 mm wide;spur cylindric,31-40 mm long,often thickened in the apical half,curved. Column 3.5-4.5 mm long,with a short basal stalk;pollinia 2, anther erect, anther canals1.7-3 mm long,straight projecting forwards.