Bulbophyllum artostigma J.J.Verm., Orchid Monogr. 7 (1993) 153, fig. 105
Type: Jongejan cult. (Reeve) 1763 = Leiden cult. 930554 (holo L, alc. only)
Rhizome creeping, 0.1-0.15 cm diam. Pseudobulbs ovoid, 0.4-0.8 cm apart, 0.7-1 by 0.4-0.7 cm, not or hardly flattened. Petiole 3-5 mm. Leaf blade elliptic, 1.7-3 by 0.81.3 cm, index 2.1-3; tip acute. Inflorescence c. 3.5 cm, 1-flowered; peduncle c. 1.4 cm. Floral bracts c. 3. the longest 0.3 cm. Floral bracts tubular, c. 2 mm; tip acute. Pedicel and ovary c. 11 mm, with the node 0.15 cm from the floral bract. Flowers moderately opening. Median sepal ovate, c. 1.15 by 0.4 cm, index 2.8-3; tip long acuminate, thin, glabrous. Lateral sepals oblique, c. 1.15 by 0.4 cm, index 2.8-3; otherwise as the median sepal. Petals approximately elliptic, 0.12 by 0.08 cm, index c. 1.5; tip subacute, margins slightly erose, thin; surface glabrous. Lip somewhat curved, general outline ovate, 0.6 by 0.42 cm, index 1.4-1.5 (not spread); tip broadly rounded; rather thick, glabrous; adaxially with a rather inconspicuously basal concavety, basal teeth converging, not touching tip and together forming a transversely ridge, basal part of the lip with a concavety around the basal teeth only, otherwise flat or slightly concave because of the upturned margins, gradually passing into the flat or slightly concave top part of the lip; abaxially approximately without a median ridge. Column from ovary to the tip of the rostellum 0.18 mm; rostellum distinctly protruding; stigma narrowly ovate, slightly protruding at its base. Column-foot with a distinct, slightly to moderately upwards pointing, rounded central knob above the attachment of the lip. Anther abaxially with a broad ridge; front margin not protruding. (After Vermeulen, 1993)
Colours: Sepals yellow with dark purple veins. Petals white with a purple vein. Lip ochre brown, paler towards the margins and yellow base.
Flowering time in the wild: July, August, October, November.
Distribution: Malesia (New Guinea).
Distribution in New Guinea: Papua New Guinea; Papua New Guinea; see map 96-143M.jpg.