Distribution map of Bulbophyllum rhomboglossum
Bulbophyllum rhomboglossum Schltr., J.J. Vermeulen, sketch, flower analysis
Bulbophyllum rhomboglossum cf.iboense, N. Howcroft, drawing, flower analysis
Bulbophyllum rhomboglossum Schltr., floral analysis, R. Schlechter in Repert. Spec. Nov. Regni Veg. Beih. 21 (1928) t. 255, fig. 973