Bulbophyllum gyaloglossum J.J.Verm., Orchid Monogr. 7 (1993) 131, fig. 84
Type: Cruttwell 3153 (holo L)
Rhizome approximately pendulous, to 35 by 0.15 cm diam. Pseudobulbs ovoid to cylindrical, 1.5-4 cm apart, 2.5-4.2 by 0.15-0.2 cm, not flattened. Petiole 2-5 mm. Leaf blade ovate, 3.5-7 by 0.6-1.1 cm, index 4.4-7; tip acute. Inflorescence 4-5 cm, 5-6-flowered; peduncle 1-1.5 cm. Floral bracts c. 2. the longest 4-5 mm. Rachis 2.8-3.5 cm. Floral bracts ovate, 2.2-4 mm; tip acute. Pedicel and ovary 0.2-0.3 cm, with the node 0.081 cm from the floral bract. Flowers moderately opening. Median sepal elliptic, 2.6-2.7 by 1.6-2 mm, index 1.3-1.7; tip rounded; rather thin, glabrous. Lateral sepals free, ovate to elliptic, 3-3.3 by 2.3-2.5 mm, index 1.2-1.5; tip approximately apiculate; rather thin, glabrous. Petals oblique, obovate, 2-2.3 by 1.1-1.5 mm, index 1.3-2.1; tip rounded, thin, glabrous. Lip approximately straight, general outline ovate, 2.2-2.3 by 1.8 mm, index c. 1.2 (not spread); tip rounded; rather thick; approximately glabrous; adaxially with a distinct basal concavety, basal teeth converging, together forming a transversely ridge with a deep slit halfway, top part of the lip also distinctly concave; abaxially without a median ridge. Column from ovary to the tip of the stelidia 1-1.4 mm; rostellum protruding; stigma approximately orbicular, protruding at its base. Column-foot with a distinct, rounded central knob above the attachment of the lip. Stelidia inconspicuously, approximately triangular; tip obtuse to acute. Anther abaxially with a ridge; margin not protruding. (After Vermeulen, 1993)
Colours: Sepals and petals white. Lip pale yellow.
Habitat: Epiphyte in montane forest; 2240 m.
Flowering time in the wild: May.
Distribution: Malesia (New Guinea).
Distribution in New Guinea: Papua New Guinea; see map 96-772M.jpg.
Cultivation: Cool growing epiphyte.