Bulbophyllum pseudotrias J.J.Verm., Blumea 41 (1996) 359, fig. 10
Type: Jongejan cult. 1529 (holo L)
Rhizome creeping, 2-3 mm diam. Pseudobulbs 1-leafed, ovoid, 2.8-7.5 cm apart, 1.5-2.0 by 0.5-1.3 cm, somewhat flattened or not. Petiole 4-7 mm. Leaf blade elliptic to ovate, 4.5-6.5 by 1.5-2.0 cm, index (length/width) 3.0-3.7, acute. Inflorescence 3.0-4.5 cm, 1-flowered. Peduncle 1.0-1.5 cm; bracts 3, the longest 4-7 mm, acute. Floral bract tubular, 6-8 mm, cuspidate. Pedicel and ovary 15-28 mm, with the node c. 4 mm from the floral bract. Flowers wide open. Median sepal spreading, flat, obovate, 17-26 by 12-15 mm, index (length/width) 1.4-1.8, shortly acuminate, margins entire, very finely ciliate, base narrowly attached; rather thick; with 7 major veins; adaxially finely pubescent; abaxially glabrous, veins not prominent. Lateral sepals free, flat, somewhat falcate, 16-23 by 12-16 mm, index (length/ width) 1.3-1.5, upper margin glabrous; adaxially finely pubescent except near the base and a strip along the upper margin; otherwise as the median sepal. Petals erect, not falcate, ovate, 2.5-3.0 by 2.5-3.0 mm, index (length/width) 0.9-1.2, the tip rounded, margins entire, very finely papillose; base narrowly attached; thin; with 1 vein; surface glabrous. Lip curved in the basal half, general outline about elliptic, 2.2-3.1 by 1.2-1.6 mm, index (length/width) 1.6-2.0 (not spread), tip rounded, margins entire, papillose and with large, narrowly conical or cylindrical vesicles towards the tip; thick and solid; adaxially with a somewhat concave basal part, with an about flat top part, with a median slit over most of its length, with 3 ridges, 2 of these rather distinct, wide, obtuse, diverging and coinciding with the margins towards the base and towards the tip, continuing over about the full length of the lip, the third a mere swelling around the median slit in the top half of the lip, adaxial surface glabrous; abaxially with a rounded median ridge which is deeply furrowed towards the tip of the lip, surface in the top half papillose, and with narrowly conical to cylindrical vesicles towards the margins. Column from ovary to the tip of the stelidia 1.5-2.2 mm long; column foot widened and with rather distinct, about semi-elliptic, rounded lateral wings at its tip. Stelidia distinct, slightly falcate, subulate, 0.9-1.2 mm, acute, with a slight, rounded wing along the lower margin, towards its base; stigma slightly protruding at its base, subtriangular. Anther abaxially with the top part papillose, overtopping the front margin, and with a distinct, rounded ridge near its base; front margin not drawn out, not concave, truncate. Pollinia (not seen). Stipes (not seen). (After Vermeulen, 1996)
Colours: Flowers whitish, heavily spotted with pinkish purple.
Habitat: Epiphyte in lower montane forest; 1050 m.
Flowering time in the wild: September.
Distribution: Malesia (New Guinea).
Distribution in New Guinea: Papua New Guinea; see map 96-2027M.jpg.
Cultivation: Intermediate growing epiphyte.