Rhizome 2.8-4 mm in diam., sections between pseudobulbs 1.5-3.8 cm, bract fibers persistent, forming a loose net around pseudobulb. Pseudobulbs distant, ellipsoid to (ob-)ovoid, prostrate on rhizome for ca. 2/3 of their length, 2-3.5 × 1-2 cm. Petiole 1.3-4 cm; leaf blade elliptic to (ob-)ovate, 6-12 × 2.4-4 cm, acute. Inflorescence erect to spreading, 4-9 cm, 1-flowered or a raceme, 2-or 3-flowered; peduncle 0.7-2.5 cm; bracts ca. 2, longest 7-9 mm; rachis 0.3-2 cm; floral bracts elliptic, sometimes tubular at very base only, 4-12 × 2.5-8 mm, acute. Flowers resupinate, moderately opening, (greenish) yellow with dark reddish purple veins, lip yellowish, abaxially mottled with reddish purple, adaxially dark reddish purple. Pedicel and ovary 19-48 mm. Dorsal sepal recurved with top incurved, elliptic to ovate-triangular, 11.5-20 × 4-11.5 mm, rather thick, glabrous, base rather broadly attached, margin entire, apex obtuse to acute; lateral sepals free, recurved, ovate to triangular, 13-20 × 6.5-11 mm, otherwise as dorsal sepal. Petals recurved, elliptic to (ob-)ovate, 11-19 × 3.5-8 mm, rather thick, glabrous, base broadly attached, margins entire, apex obtuse to acute; lip recurved, ovate but constricted ca. halfway, 7-13 × 4-7 mm (all without artificial spreading), thick; abaxially with a retuse median ridge up to 1/2-2/3 of length of lip, surface glabrous; adaxially concave proximally, convex distally, with a median slit over most of length of lip, proximally widening into a shallow cavity bordered by 2 short, distally converging ridges, with 2 more high ridges with straight, entire crests starting at inner surface of auricles and converging gradually, reaching up to ca. 2/3 of length of lip, surface in between finely papillose, surface distally and toward margins almost glabrous to coarsely rugose, margins erose, with a distinct, triangular, obtuse, auricle with a denticulate tip at ca. 1/3 of length of lip, apex obtuse. Column 5-7 mm, stigma inside with 3 keels, at its base without teeth, column foot with a triangular, acute tooth on each side of ligament; stelidia triangular to subulate, 1-2 mm, acute, with or without a small antrorse, subacute tooth along upper margin, with a distinct, obliquely antrorse, deltoid, obtuse tooth along lower margin, slightly below middle of column; anther abaxially ± glabrous and with high, dorsiventrally flattened, triangular, obtuse crest; front margin not drawn out, entire; pollinia without a stipe. Fl. May-Jul, Oct-Dec.
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