Bulbophyllum bacilliferum J.J.Sm., Bull. Jard. Bot. Buitenzorg, sér. 3, 10 (1928) 155
Type: Rutten 2239 (Moluccas, Ceram, Matina) (holo L; iso BO)
Rhizome pendulous, to 50 by 0.25-0.5 cm diam. P.seudobulbs ovoid, 2.5-4.5 cm apart, 2-3 by 0.6-0.8 cm, somewhat flattened. Petiole 4-7 mm. Leaf blade ovate to elliptic, 5.8-8.5 by 1-2.3 cm, index 3.3-5.8; tip acute. Inflorescence 2.8-5.5 cm, 4-8-flowered; peduncle 1-1.7 cm. Floral bracts c. 5. the longest 5-7 mm. Rachis 1.8-3.8 cm. Floral bracts triangular, 1.5-3.5 men, acute. Pedicel and ovary c. 2 mm, with the node 0.07 cm from the floral bract. Flowers hardly opening. Median sepal elliptic, c. 4 by 1.8 mm, index c. 2.2; tip short obtuse; rather thick, glabrous. Lateral sepals free, c. 4.3 by 1.7 mm, index c. 2.5. otherwise as the median sepal. Petals obovate, c. 3 by 1.3 mm, index 2.3; tip rounded, margins finely papillose towards the tip, thin; surface glabrous. Lip curved towards the tip, general outline approximately elliptic, c. 2.4 by 1 mm, index c. 2.4 (not spread); tip rounded, thick, glabrous; adaxially with a distinct basal concavety, basal teeth converging, touching along their entire proximal margins, leaving only an approximately closed slit in between them and together forming a transversely ridge, basal part of the lip concave, gradually passing into the convex top part of the lip; abaxially approximately without a median ridge. Column from ovary to the tip of the rostellum 0.7 mm; rostellum distinctly protruding; stigma approximately orbicular, protruding at its base. Column-foot with a rounded central knob above the attachment of the lip. Stelidia approximately absent. Anther abaxially with a ridge which distinctly protrudes beyond the front margin; front margin not protruding. Pollinia (not seen). (After Vermeulen, 1993)
Colours: Sepals and petals creamy white. Lip creamy yellow.
Flowering time in the wild: July, September.
Distribution: Malesia (Moluccas, New Guinea), Solomon Islands.
Distribution in New Guinea: Papua (Indonesia); Papua New Guinea; see map 96-166M.jpg.