Orchids of New Guinea

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Bulbophyllum bigibbosum

Bulbophyllum bigibbosum J.J.Sm., Repert. Spec. Nov. Regni Veg. 12 (1913) 401

Type: Gjellerup 1106

Rhizome short. Pseudobulbs close together, elliptic or subglobose, longitudinally grooved, 0.5-0.9 by 0.55-0.5 cm; 1-leaved. Leaf oblong-elliptic, obtuse or rounded, fleshy coriaceous, rigid, 0.95-1.25 by 0.55 cm; base abruptly contracted in a very short, conduplicate-channelled petiole; above on either side of the midrib grooved, prominent, below convex. Inflorescences 1-flowered, in fascicles from the base of the pseudobulbs, much longer than the leaf, filiform, c. 2.75-3 cm long; with c. 2. small, tubular, keeled sheaths. Floral bract tubular, above slightly infundibuliform-widened, apiculate, keeled, 0.2 cm long. Flower medium size. Median sepal narrowly lanceolate, long filiform-acuminate, concave, above channelled, papillose-finely ciliate, 3-nerved, c. 1.85 by 0.24 cm. Lateral sepals narrowly lanceolate, long filiform-acuminate, falcate, concave, very minutely papillose, 3-nerved, c. 1.8 by 0.25 cm; tail 0.73 cm long. Petals very small, parallel, porrect, spathulate, apiculate, 1-nerved, 0.25 cm long; the upper 3/5th long irregularly fimbriate, the hairs 0.13 cm long. Lip mobile, slightly wavy; claw short, membranous; above the base on either side dilated in a backwards pointing, obtuse lobule; attached to the column-foot, above the base contracted, front part elliptic-oblong, obtuse, convex; underneath concave, in basal half almost above near margins villose, upper part glabrous; at the base in front of the callus abruptly swollen into a pilose, grooved callus which is bilobed towards the base, decurrent in a single rib towards the apex, 0.73 by 0.23 cm. Column subconical, angular, without the anther 0.13 cm long; filament short, recurved, quadrangular, apex narrowed truncate; stelidia short; stigma transversely elliptic; column-foot making an obtuse angle with the ovary, thick, straight, cuneate-oblong, concave, 3-nerved, the apex 0.1 cm long, on either side strongly triangular-dilated, truncate. Anther shorter, triangular, obtuse, upper margin in a tooth rather large suberect provided with. Anther cucullate, subovate, apex extended and truncate; connective thickened, 0.05 cm long. Rostellum truncate. Ovary 6-grooved, 0.18 cm long; pedicel 0.85 long, 0.2 cm above the base articulate. (After Smith, 1916)