Rhizome 1.2-2 mm in diam., sections between pseudobulbs 0.4-2 cm, bract fibers hardly persistent. Pseudobulbs close together, not or hardly prostrate proximally, ovoid to almost globose, 0.7-3 × 1.3-2 cm. Petiole 0.2-1.5 cm; leaf blade elliptic to ovate, 2.2-12 × 1-2.8 cm, obtuse to acute. Inflorescence erect to spreading, 3.6-6 cm, 1-flowered; peduncle 0.6-2 cm; bracts ca. 2, longest 5-8 mm; floral bracts tubular for 2/3 or more or their length, 4-6.5 mm, acute. Flowers resupinate, moderately opening, yellow or yellowish green with reddish purple dots, lip yellow, heavily stained with reddish purple adaxially, column yellow. Pedicel and ovary 20-26 mm. Dorsal sepal recurved with top incurved, elliptic to ovate, 8-12 × 4.5-9 mm, rather thick, glabrous, base rather broadly attached, margin entire, apex obtuse to acute; lateral sepals free, recurved, (ovate-)triangular, 9-13 × 6-10 mm, (sub-)acute, otherwise as dorsal sepal. Petals recurved, elliptic to obovate, 6-10 × 3-5 mm, rather thick, glabrous, base broadly attached, margins entire to finely erose-denticulate, apex rounded and apiculate to subacute; lip recurved close to tip, ovate, 5.5-8.5 × 4-6 mm, (all without artificial spreading), thick; abaxially with a rounded median ridge over most of length of lip, surface glabrous; adaxially slightly concave proximally, convex distally, with a median slit over most of length of lip sometimes shortly interrupted proximally, with 2 thin ridges with wavy, erose crests starting on inner surface of auricles and running almost parallel or converging slightly up to ca. 3/4 of length of lip, surface in between partly or almost entirely covered with irregular, wavy transverse ribs, surface toward margins verrucose with verrucae often arranged in oblique, irregular and frequently interrupted crests, margins entire, somewhat irregular distally, with a triangular, obtuse to acute, somewhat erose-lacerate auricle at ca. 1/3 of length of lip, apex rounded to truncate. Column 3.8-5 mm, stigma inside with 3 keels, at its base without teeth, column foot without a tooth above ligament; stelidia triangular, 1.2-2 mm, acute, with or without a small subacute tooth along upper margin, with a distinct, spreading, straight, triangular, obtuse to acute tooth along lower margin, ca. halfway along column; anther abaxially ± glabrous and with high, conic, sharp crest; front margin not drawn out, erose; pollinia ?without a stipe. Fl. Feb, Aug, Oct-Nov.
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