Rhizome slender, 2-3 mm in diam., internodes ca. 4 cm. Pseudobulbs widely spaced along rhizome, cylindric, 1.5-3.5 cm × 2-4 mm, petiole-like, enclosed by sheaths. Leaf blade ovate-lanceolate or oblong-lanceolate, 7-22 × 3-8 cm, papery, base subrounded or sometimes slightly cuneate, margin undulate, apex acuminate; petiole 1-2 cm. Peduncle to 38 cm, with several sheaths below; rachis laxly 4-9-flowered; floral bracts narrowly lanceolate, 4-6 × ca. 2.5 mm, acuminate. Flowers: sepals and petals green, adaxial apex with red spots, lip white with red spots and stripes; pedicel and ovary 1-1.5 cm. Dorsal sepal narrowly oblong-lanceolate, 15-17 × 2.2-2.5 mm, 3-veined, acuminate; lateral sepals falcate-oblanceolate, slightly shorter and wider than dorsal sepal, 3-veined, base adnate to column foot, apex acuminate; mentum spurlike, ca. 4 mm. Petals similar to sepals, ca. 16 × 2 mm, 3-veined, acuminate; lip suborbicular, 10-14 mm, claw ca. 5 mm, 3-lobed at middle; lateral lobes obliquely ovate, ca. 8 mm wide (flattened), acute, apical margin irregularly serrate; mid-lobe obovate, ca. 5 mm wide, rounded and slightly concave, margin irregularly serrate; disk with 2 lamellae from base running to mid-lobe. Column ca. 1 cm, base dilated, foot ca. 4 mm, with wings dilated on upper part and rounded-auriculate. Fl. May-Sep.
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