Sites where B. bifarium specimens have been collected include: along the Douala to Bimbia road; Mfongu near Bagangu; Bana-Bateha near Fibé; Nkokom Massif near Ndom; Nyasoso on Mount Kupe; Kodmin in the Bakossi Mountains; and on Mount Cameroon.
The knowledge of the existence of B. kupense is learned only by a singular epiphyte on one small, cultivated mango tree (Mangifera indica), in a private garden in Nyasoso (at elev. 830 m), Mount Kupe.