Distribution map of Bulbophyllum ptychantyx
Bulbophyllum ptychantyx J.J.Verm., flower, photo N.E.G. Cruttwell, based on Cruttwell 3339 (2/91, PNG, Teptep)
Bulbophyllum ptychantyx J.J.Verm., Orchid Monogr. 7 (1993) 170, fig. 125, J.J. Vermeulen, drawing, plant habit and flower analysis, based on C 14485 (E); b-g Cruttwell 3339 (holo L)