This name is a synonym of Dioscorea preussii subsp. hylophila (Harms) Wilkin.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 240291) with original publication details: Pflanzenw. Ost-Afrikas C: 146 1895.
This name was in version 1 of The Plant List, record kew-240291, and has not been changed.