Hi,
the plant looks like B. fuscum or B. acutebracteatum but its difficult to say without dissection of the flowers. Moreover, this two species have varieties. J.J. Vermeulen has made a good monograph on African Bulbophyllum.
Vermeulen J.J. (1987) A taxonomic revision of the Continental African Bulbophyllinae. Orchid Monogr. 2: 1-300.
Cheers,
V.Droissart
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