Bulbophyllum orbiculare

Smith, J.J., Nova Guinea 12, 1 (1913) 94, t. 26, fig. 79
Smith, J.J., Nova Guinea 12, 4 (1916) 413, t. 156, fig. 290, as Bulbophyllum glabrilabre J.J.Sm.
Schlechter, R., Repert. Spec. Nov. Regni Veg. Beih. 21 (1928) t. 305, fig. 1173, as Bulbophyllum verrucirhachis Schltr.
Schlechter, R., Repert. Spec. Nov. Regni Veg. Beih. 21 (1928) t. 305, fig. 1172, as Bulbophyllum habropus Schltr.
Vermeulen, J.J., Orchid Monogr. 7 (1993) 110, fig. 58j & 67a-j