Bulbophyllum mulderae J.J.Verm., Orchid Monogr. 7 (1993) 106, fig. 63
Type: Leiden cult. (Schuiteman, Mulder & Vogel 90-116) 31482 (holo L, alc. only)
Rhizome pendulous perpendicularly, to 35 cm long; flattened and winged, large,t diam. 0.04-0.06 cm. Rhizome portion between two pseudobulbs without a node approximately half-way. Rhizome scales of the longest internodes distinctly shorter than those internodes, leaving bare large portions of the rhizome. Roots generally close to the base of the rhizome. Pseudobulbs cylindrical, 0.5-1.8 cm apart, 0.2-0.3 by 0.08-0.1 cm, not flattened. Petiole 0.5-1 mm. Leaf blade ovate to elliptic, or orbicular, 0.5-1.3 by 0.5-1.2 cm, index 11.5; tip finely acuminate. Inflorescence 1-1.5 cm, 1-or 2-flowered; peduncle 0.3-0.5 cm. Floral bracts 2. the longest c. 2 mm. Rachis if present 0.01-0.1 cm. Floral bracts triangular, c. 2 mm; tip acuminate. Pedicel and ovary 0.4 cm, with the node 1-0.12 cm from the floral bract. Flowers all open time, moderately opening. Median sepal ovate, 13-15 by 2.5 mm, index 5-6; tip long acuminate to caudate, thin, glabrous. Lateral sepals free, oblique, triangular, 14-15 by 3 mm, index 4-5. otherwise as the median sepal. Petals ovate to elliptic, c. 4 by 1.8 mm, index c. 2.2; tip approximately acute, thin, glabrous. Lip curved, general outline ovate, in lateral view highest near the base, c. 3.8 by 1.5 mm, index c. 2.5 (not spread); tip obtuse, thick but soft, glabrous; adaxially concave near the base; abaxially with an inconspicuously, retuse median ridge. Column from ovary to the tip of the stelidia 0.8; stigma protruding at its base (base of stigma angular in lateral view), approximately triangular. Column-foot approximately without accessories. Stslidia inconspicuously, triangular; tip acute; with a small, approximately subacute, tooth along the upper margin. Anther abaxially with a ridge towards its tip; front margin hardly protruding. Pollinia 2. (After Vermeulen, 1993)
Colours: Leaves often tinged purplish, somewhat glaucous abaxially. Flowers white.
Habitat: Epiphyte in montane forest; 1550-1600 m.
Flowering time in the wild: May, November.
Distribution: Malesia (New Guinea).
Distribution in New Guinea: Papua New Guinea; see map 96-1193M.jpg.
Cultivation: Cool growing epiphyte.