Bulbophyllum sandersonii

Another species from sec Megaclinium. Widespread across West and tropical Africa. The length of the rhachis in this species can be as short as four inches or up to 8" long. The petals do not descend or droop as they do in B. imbricatum. There is a sub species of B.sandersonii:
ssp.stenopetalum with a stouter rhizome and slightly different petals on the flowers.
bernabu