Mount Kupe and the Bakossi Mountains are now probably the stronghold for A. gabonensis.
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.
It is native to Cameroon (Enyandong, Mt Kupe and the Bakossi Mountains), and Nigeria, where it is found growing habitually in submontane and montane, tropical or subtropical, moist forest, at elevations roughly between 800 and 2,050 meters.
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