Distribution map of Bulbophyllum quadrangulare
Bulbophyllum quadrangulare J.J.Sm.,, flower, lateral view, photo J.J. Vermeulen, based on Leiden cult 20031934
Bulbophyllum quadrangulare J.J.Sm.,, flower, oblique lateral view, photo J.J. Vermeulen, based on Leiden cult 20031934
Bulbophyllum quadrangulare J.J.Sm., flower detail, centre of flower, oblique lateral view, photo E.F. de Vogel, Leiden cult. 20031631
(STEREO) Bulbophyllum quadrangulare J.J.Sm. aff., flower detail, column and lip, front view, photo P. Jongejan, collection Royal Botanic Gardens, Kew, cult. P. Jongejan 1420
(STEREO) Bulbophyllum quadrangulare J.J.Sm., flower detail, centre of flower, oblique lateral view, photo P. Jongejan, collection Royal Botanic Gardens, Kew, cult. P. Jongejan 1420
Bulbophyllum quadrangulare J.J.Sm., P. O'Byrne, drawing
Bulbophyllum quadrangulare, N. Howcroft, drawing, plant habit and flower analysis
Bulbophyllum quadrangulare J.J.Sm., floral analysis, drawing J.J. Smith, from Bogor cult. (Branderhorst 68B) s.n.
Bulbophyllum quadrangulare J.J.Sm., flower, drawing J.J. Smith, from Bogor cult. (Branderhorst 68B) s.n.
Bulbophyllum quadrangulare J.J.Sm. var. latisepalum J.J.Sm., floral analysis, drawing J.J. Smith, from Gjellerup 641
Bulbophyllum adenambon Schltr., floral analysis, R. Schlechter in Repert. Spec. Nov. Regni Veg. Beih. 21 (1928) t. 262, fig. 999
Bulbophyllum quadrangulare J.J.Sm., herbarium sheet, probably holotype specimen, Bogor cult. (Branderhorst) s.n. (upper Digoel) (BO, probably holotype specimen)
Bulbophyllum quadrangulare J.J.Sm. var. latisepalum J.J.Sm., herbarium sheet, Gjellerup 641 (holotype specimen BO)