Diplocaulobium tuberculatum (J.J.Sm.) P.F.Hunt & Summerh., Taxon 10 (1961) 109.
Basionym: Dendrobium tuberculatum.
Rhizome creeping, branching. Pseudobulbs at an acute angle to the rhizome, 1-1.5 cm apart, 1-leaved, elongated ovoid-conical, 6-7 angled, 2.2-2.75 by 0.65-0.78 cm. Leaves erect, lanceolate, 4-6.5 by 1-1.4 cm, coriaceous, apex obtuse, bilobulate. Inflorescences arising in fascicles of 3-9 from the apex of the pseudobulb, 1-flowered; spathe 0.65 cm long. Pedicel 1.25-1.4 cm long; ovary 0.2 cm long, 6-grooved, subverruculose. Flower c. 1.5-1.9 cm across. Sepals and mentum sparsely verrucose outside. Dorsal sepal triangular-lanceolate, 1 cm by 3 mm, apex narrowly obtuse. Lateral sepals obliquely triangular-lanceolate, 1 cm by 5.6 mm, apex acute; mentum 0.45 cm long, obtuse. Petals recurved, linear-spathulate-lanceolate, 0.9 cm by 1 mm, apex acute. Lip 3-lobed, 1 by 0.38 cm, with 3 keels; free part of lateral lobes short, triangular, 0.6 mm long; midlobe oblong-subobovate-elliptic, 0.55 by 0.33 cm, undulate, papillose, apiculate. Column 0.15 cm long, stelidia dentate, filament subulate; column-foot 0.43 cm long, outside with 2 longitudinal rows of 8-12 small warts.
(after Smith, 1916).
Colours: Flower white, lip yellowish white, at base of midlobe and below spotted brown-purple, midlobe in the centre yellow.
Habitat: Presumably epiphyte in rainforest in the lowlands.
Flowering time in the wild: Not known.
Distribution: New Guinea (endemic).
Distribution in New Guinea: Papua (Merauke Regency: Lorentz River).
Notes: Diplocaulobium tuberculatum belongs in the affinity of Diplocaulobium chrysotropis, Diplocaulobium tropidophorum, etc.
Cultivation: Warm growing epiphyte.