Distribution map of Bulbophyllum cycloglossum
Bulbophyllum cycloglossum Schltr., Orchid Monogr. 7 (1993) 157, fig. 110, J.J. Vermeulen, drawing, plant habit and flower analysis, based on Edinburgh cult C 6457 (E)
Bulbophyllum cycloglossum Schltr., floral analysis, R. Schlechter in Repert. Spec. Nov. Regni Veg. Beih. 21 (1928) t. 310, fig. 1190
Bulbophyllum cycloglossum Schltr., herbarium sheet, Schlechter 18735 (isotype specimen BO)