Bulbophyllum rectilabre J.J.Sm., Repert. Spec. Nov. Regni Veg. 11 (1912) 277
Type: Gjellerup 889 (holo BO; iso L)
Rhizome creeping, terete, 0.3 cm diam., entirely covered with large, tubular, acuminate, punctate sheaths. Pseudobulbs c. 1.6-1.8 cm apart, obliquely erect, obliquely conical, strongly longitudinally grooved, c. 2.8 by 1 cm; 1-leaved. Leaf narrowly lanceolate, acute, in total c. 10-15.5 by 1.4-1.85 cm; base narrowed into a c. 1.1-1.75 cm long petiole; midrib above grooved, underneath obtusely prominent, coriaceous. Inflorescences from the nodes of the rhizome, more or less fascicled, short, 1-flowered; peduncle 0.5 cm long, with tubular, acute sheaths. Floral bract tubular, acute, keeled, 0.1 cm long. Flower rather large. Median sepal linear, almost 2.1 by 0.33 cm; apex conduplicate, short-acute; nerves 3, dorsally prominent. Lateral sepals obliquely linear-lanceolate, shortly conical-acuminate, concave, c. 2 by 0.43 cm; base convex; nerves 3 dorsally prominent. Petals very small, slightly incurved, obliquely narrowly lanceolate, somewhat sigmoid, subacute, convex, 1-nerved, 0.65 by 0.16 cm; base concave; margins in the middle irregular. Lip immobile, almost straight, subclavate, from above lanceolate-linear, c. 1.6 by 0.33 cm when not flattened; base truncate, with 2 minute auricles; the lower quarter somewhat claw-like-contracted, claw oblong, somewhat concave, with very narrow, suberect margins which almost touch at the base, fleshy, 0.35 by 0.14 cm; underneath convex with a longitudinal groove; blade fleshy, lanceolate, obtuse, strongly convex, channelled, finely warty, with recurved, thick, underneath high margins. Column curved, with high, acutely angled, emarginate apex, below the stigma swollen in an obtuse-angled, laterally compressed thickened, 0.35 cm long callus; clinandrium erose; stigma longitudinal, linear; stelidia rather short, with 2 divergent teeth; column-foot short, wart-shaped. Anther cucullate, laterally compressed; apex short-acute and slightly recurved. Pollinia 4, oblong, laterally compressed, inner ones very thin. Ovary 6-angular, furfuraceous-punctate, 0.4. cm long; pedicel slender, sparsely punctate, 0.73 cm long. (After Smith, 1916)
Colours: Sepals violet with white longitudinal striped. Lip red-brown.
Habitat: Epiphyte in (dry) lowland forest (on limestone and basalt); 300-750 m.
Flowering time in the wild: March, November.
Distribution: Malesia (New Guinea).
Distribution in New Guinea: Papua (Indonesia); see map 96-1546M.jpg.
Cultivation: Warm growing epiphyte.