Bulbophyllum intersitum J.J.Verm., Orchid Monogr. 7 (1993) 161, fig. 114, pl. 5d
Type: Jongejan cult. 795 = Leiden cult. 22484 (Jongejan, Schuiteman & de Wilde) (holo L only spirit 8023)
Rhizome creeping, 0.8-1.2 mm diam. Pseudobulbs ovoid, 0.2-0.7 cm apart, 0.3-0.9 by 0.2-0.4 cm, not or hardly flattened. Petiole 1-10 mm. Leaf blade elliptic to obovate, 0.6-4 by 0.2-0.7 cm, index 2.4-14, tip acute. Inflorescence 4.5-8 cm, 1-flowered. Peduncle 3.5-6.5 cm; bracts c. 2, the longest 1.8-3 mm. Floral bracts tubular, 1.5-3 mm, tip acute to acuminate. Pedicel and ovary 3.5-12 mm, with the node 1-2.5 mm from the floral bract. Flowers moderately opening. Median sepal ovate, 6-24 by 1.5-2.8 mm, index 3.5-8.6, tip long acuminate to caudate; margins glabrous to finely ciliate; thin; surface glabrous. Lateral sepals free (sometimes somewhat adherent along their lower margins), oblique, 8-29 by 1.5-4 mm, index 2.3-8.3; otherwise as the median sepal. Petals ovate to elliptic, 0.6-1.5 by 0.8-1.5 mm, index 0.4-1.3, tip rounded to acute; margins glabrous to erose; thin; surface glabrous. Lip somewhat curved at the base, general outline ovate to triangular, often somewhat tapering towards the tip, 2.5-4.5 by 1-2.3 mm, index 1.8-2.9 (not spread), tip acute; margins finely papillose to ciliate; rather thick; surface glabrous or finely papillose locally; adaxially with a distinct basal concavity, basal teeth converging, together forming a transverse ridge with a deep notch half-way, top part of the lip flat or convex; abaxially with an inconspicuous, truncate median ridge. Column from ovary to the tip of the rostellum 1-1.8 mm; rostellum distinctly protruding; stigma obovate, slightly protruding at its base or not; column foot with a distinct, distinctly upwards pointing, rounded central knob above the attachment of the lip. Anther abaxially with a wide ridge towards its tip; front margin not protruding.
(After Vermeulen, 1993)