Bulbophyllum idenburgense J.J.Sm., Nova Guinea 14 (1929) 451, pl. 73, fig. 98
Type: Feuilletau de Bruyn 101 (holo L; iso BO)
Epiphyte, very small. Rhizome creeping, rooting; sheaths tubular, membranous. Pseudobulbs 0.2-0.4 cm apart, probably quadrangular, ovoid or more elongated, when dried 0.65-0.8 cm long. Leaf lanceolate, subobtuse and shortly apiculate or subacute, apex minutely serrulate, rigid, thinly coriaceous, c. 2-2.6 by 0.45-0.53 cm when dried; base shortly contracted in a petiole; midrib above grooved when dried; underneath prominent. Inflorescences 1-flowered, from the rhizome, much longer than the leaves; peduncle thin, c. 5.5 cm long, at the base with few small, tubular scales. Floral bract tubular, 0.26 cm long; apex extended, acute, keeled. Median sepal oblong, subobtuse, subulate, mucronate, concave, 3-nerved, 0.85 cm long; mucro 0.08 by almost 0.3 cm. Lateral sepals obliquely oblong, falcate, 4-nerved, c. 1.25 by 0.45 cm; base narrowed, concave; apex pointed with an obtuse apicule. Petals very small, above the column porrect, parallel, obliquely oblong, in the middle slightly constricted, 1-nerved, 0.4 by 0.18 cm at the base, above 0.13-0.15 cm wide; apex very shortly subobtuse, tip acuminate; margins irregular, front margin at the base with an obtuse angle dilated. Lip minute, mobile, attached with a narrow ligament to underneath near the apex of the column-foot, suboblong, above the base recurved, obtuse, 0.15 cm long; back in lobules 2 recurved falcate obtuse, exeuns, margins at the base erect, above the base, recurved; front part convex; upper side with 2 small, longitudinal ribs. Column rather slender, straight, below the clinandrium slightly constricted, 0.18 cm long; clinandrium oblique, hollow; stelidia porrect, parallel; base short, wide, long subulate-filiform-extended, slightly falcate, much longer than the anther. Anther cucullate, elliptic; apex extended in a appendage latam, abruptly incurved,; connective convex-thickened keel-shaped, 0.06 cm long.; stigma longitudinal, oblong; column-foot making an obtuse angle with the ovary, porrect, with fairly wide base, adnate to the lateral sepals and below the stigma slightly swollen, the front part free from the sepals, incurved, the apex strongly dilated, truncate, when not flattened 0.15 cm long, apex 0.06 cm wide. Ovary 6-grooved, 0.2 cm long; pedicel thin, terete, 0.7 cm long, 0.18 cm above the base articulate. (After Smith, 1929)
Colours: Not recorded.
Habitat: Epiphyte in lowland forest; 400 m.
Flowering time in the wild: September.
Distribution: Malesia (New Guinea).
Distribution in New Guinea: Papua (Indonesia); see map 96-841M.jpg.
Cultivation: Warm growing epiphyte.