Description: Rhizome patent to pendulous, up to 15 cm long, 3–4 mm in diameter, sections between pseudobulbs 2.4–3 cm long, cataphylls persistent. Pseudobulbs 1.0–1.5 × 0.4–0.5 cm, distant, ellipsoid-cylindrical. Leaves subsessile, 5.3–6.2 × 2.1–3.2 cm, index (length/width) 1.8–2.5, elliptic to ovate, acute, abaxial surface corrugated. Inflorescence c. 2 cm long, one-flowered; peduncle porrect, c. 0.5 cm long; peduncle scales two, the longest c. 4 mm long; floral bract c. 6 mm long, tubular, acute. Flowers opening widely, without noticeable smell, lasting about 12 h, largely nocturnal, opening from 22:00 h to 10:00 h in cultivation. Pedicel with ovary c. 10 mm long, basal node on a c. 4-mm-long stump. Dorsal sepal c. 14 × 4 mm, index c. 3.5, spreading, ovate, acute, margins entire, base broadly attached, thick, surface glabrous. Lateral sepals c. 15 × 4 mm, index 3.7–3.8, free, triangular, otherwise as the dorsal sepal. Petals c. 1 × 2 mm, index c. 0.5, porrect, forming a narrow seam along the base of the column, entire (excluding the appendages), surface glabrous; with two types of stalked, papillose appendages along the apical margin; the first type thick, widest near the base and gradually tapering distally, 5.5–8.0 × 0.2–0.3 mm, acute, abruptly narrowed into a thread-like stalk c. 2 mm long, the second type much thinner, subulate, 3.0–3.5 mm long, gradually passing into a 1.5–2.0 mm thread-like stalk; these appendages divided into three groups: three and four of the first type at the upper and lower edge of the petal respectively, three of the second type in between. Lip c. 3.3 × 1.3 mm, index 2.5–2.6, straight, three-lobed with patent, triangular, acute lobes attached to the proximal 1/4–1/5 of the length of the lip, midlobe obovate, acuminate, thick; adaxial surface constricted to a narrow, deeply furrowed, irregularly verrucose strip with irregular edges; abaxial surface inflated, somewhat furrowed, increasingly papillose with elongated papillae towards the tip. Column c. 2.4 mm long; foot slightly widened distally; stelidia c. 0.7 mm long, triangular, obtuse, upper margin erose, lower with a patent, deltoid, subacute tooth with a much smaller tooth on its front margin; anther cap abaxially with a narrow crest, surface glabrous, front margin drawn out into a retuse beak; pollinia four, inner ones about half as long as the outer.