Bulbophyllum ptychostigma J.J.Verm., Nordic J. Bot. 26 (2008) 159, fig. 18
Type: Yumte 76 (holo L), from Indonesia, Papua, Bird's head Peninsula
Roots sprouting mainly below the pseudobulbs. Rhizome 1.5-2 mm in diameter, sections between pseudobulbs 0.35-0.4 cm long, short-creeping, bracts not persistent. Pseudobulbs 0.8-1 by 0.35-0.5 cm, borne close together, obliquely erect, ovoid. Leaves: petiole 0.25-0.4 cm long; blade 7.5-9.5 by 1.3-1.5 cm, index (length/width) 5.7-6.4, elliptic, acute. Inflorescence c. 1.3 cm long, 1-flowered; peduncle c. 0.55 cm long, erect; non-floriferous bracts c. 2, the longest c. 7 mm long; floral bract c. 6.5 mm long, tubular, acute. Flowers moderately opening. Pedicel-with-ovary c. 2 mm long, basal node coinciding with the bract attachment. Dorsal sepal c. 5 by 2.3 mm, index 2.1-2.2, porrect or somewhat recurved, triangular, acute, margins entire, base broadly attached, thick, surface glabrous. Lateral sepals c. 5.3 by 2 mm, index 2.6-2.7, fused along their lower margins, obliquely ovate, otherwise as the dorsal sepal. Petals c. 1.5 by 0.9 mm, index 1.6-1.7, porrect, more or less elliptic, acuminate, margins erose distally, base broadly attached, rather thick, surface glabrous. Lip c. 2.6 by 0.9 mm, index c. 2.9, somewhat recurved for two fifths of its length, general outline ovate, obtuse, margins with one pair of retrorse, slightly inwards falcate, triangular, obtuse auricles close to the ligament, beyond these the lip margins sparsely, finely and shortly ciliolate, particularly in the proximal half and near the tip, rather thick, surface glabrous; adaxially slightly concave in the proximal half, convex distally, abaxially convex near the base, elsewhere concave. Column c. 1 mm long; stigma elliptic, with 6 folds inside, with a conical, obtuse tooth well below its proximal margin; foot hardly widened; stelidia c. 0.6 mm long, narrowly triangular, acute; anther-cap abaxially with a large, rounded crest near the base, surface papillose, front margin drawn out into a truncate beak; pollinia 4, the outer ovoid, the inner slightly less than half as long as the outer, obovoid, slightly more flattened; no appendages. (After Vermeulen, 2008)
Colours: Sepals creamy-white proximally, the dorsal wine-red distally, column creamy-white.
Distribution: Malesia (New Guinea).
Distribution in New Guinea: Papua (Indonesia); see map 96-2338M.jpg.