This name is a synonym of Notobubon sonderi (M.Hiroe) Magee.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Umbell. World 1128 1979.
This name was in version 1 of The Plant List, record kew-2479194, and has not been changed.