Bulbophyllum flavicolor J.J.Sm., Nova Guinea 14 (1929) 453, pl. 73, fig. 100
Type: Lam 1498 (holo L; iso BO)
Epiphyte, very small. Rhizome creeping, terete, with a root from the base of the pseudobulb; internodes long; sheaths short, tubular, apiculate. Pseudobulbs base 0.4-0.7 cm apart, depressed, adnate to the rhizome, obliquely elliptic, 0.2-0.3 cm long, 0.43-0.58 by 0.3-0.32 cm; 1-leaved. Leaf wide, suborbicular-elliptic to elliptic, obtuse, apiculate; base shortly contracted in a slightly concave petiole. Inflorescences 1-flowered, from the base of the pseudobulbs, solitary; peduncle filiform, 0.8-0.9 cm long, at the base with few small tubular scales. Floral bract tubular, entirely covering the ovary, appressed to the median sepal, 0.15 cm long; apex widened, recurved, obtuse, apiculate. Flower very small, 0.45 cm long, the sepals and petals subparallel. Median sepal lanceolate, the 2/3rd upper part narrowed, acute, to the apex slightly thickened, slightly concave, 3-nerved, almost 0.5 by 0.17 cm. Lateral sepals decurrent on the column-foot, obliquely lanceolate-triangular, acute, to the apex rather thick, 3-nerved, 0.5 by 0.14 cm at the base. Petals at the base elliptic concave, long very acute subulate-acuminate, glabrous, 1-nerved, in total 0.42 by 0.12 cm; apex thickened, 0.18 cm long. Lip small, with minute claw inserted on the column-foot, mobile, somewhat sigmoid, simple, thin, oblong, obtuse, concave, 3-nerved, when not flattened almost 0.2 by 0.18 cm; base shortly contracted, with a small, short, longitudinal channel; apex slightly recurved, convex; underneath except for the apex convex; top half with papillose-finely ciliate margins. Column very short, 0.06 cm long; clinandrium concave with triangular and thin filament; stelidia short, horizontal, truncate, slightly retuse. Anther very small, high cucullate, 0.04 cm tall; back extended; apex extended in a quadrangular, truncate, channelled beak; connective high, subglobose, minutely cellular-verruculose.; stigma almost entirely covering the front of the lower part of the column, decurrent on the base of the column-foot, longitudinal, elliptic; column-foot making an obtuse angle with the ovary, straight, oblong, its apex not dilated, rounded-truncate, 0.08 cm long. Ovary 6-grooved, 0.07 cm long. (After Smith, 1929)
Colours: Pseudobulbs and leaf light green. Flower bright yellow. Lip somewhat darker yellow. Column somewhat lighter yellow.
Habitat: Epiphyte in lower montane forest; 1420 m.
Flowering time in the wild: October.
Distribution: Malesia (New Guinea).
Distribution in New Guinea: Papua (Indonesia); see map 96-659M.jpg.
Cultivation: Intermediate growing epiphyte.