Bulbophyllum microthamnus Schltr., Bot. Jahrb. Syst. 58 (1923) 141
Type: Ledermann 11240 (holo B, lost)
Epiphyte, erect or spreading, branched. Rhizome stem-like, branched, more or less flexuose. Pseudobulbs numerous, distant covered with. Pseudobulbs very small, cylindrical or ovoid-cylindrical, 0.2 cm high; 1-leaved. Leaf linear-ligulate, apiculate, towards the base somewhat narrowed, 1-1.5 by 0.15-0.28 cm. Inflorescences 1-flowered, very short; peduncle very short, covered with 2-3 peduncle-scales. Floral bracts ovate, obtuse, longer than the ovary. . Sepals oblong, obtuse, margins minutely finely ciliate, 0.35 cm long. Lateral sepals connate in a broadly oblong, at the apex shortly and obtusely bilobulate synsepal, at the base forming a very short and obtuse mentum. Petals at the base obliquely oblong, linear-narrowed, subacute, glabrous, almost as long as the sepals. Lip in outline rhombic-spathulate, obtuse, 0.18 cm long; base cordate-emarginate; above the base with a very small, high, emarginate callus; apical half with ciliate margins. Column short; stelidia at the base linear, subulate, about as long as the column, suberect; column-foot short. Ovary sessile cylindrical glabrous, 0.4 cm long. (After Schlechter, 1923)
Colours: Flower bright yellow, with dark brownish-red stripe.
Habitat: Epiphyte in lower montane forest; 1300 m.
Flowering time in the wild: March.
Distribution: Malesia (New Guinea).
Distribution in New Guinea: Papua New Guinea; see map 96-1159M.jpg.
Cultivation: Intermediate growing epiphyte.