This name is a synonym of Gastrorchis lutea subsp. longibracteata (S.Moore) P.Bernet.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 151119) with original publication details: Fl. Mauritius 349 1877.
This name was in version 1 of The Plant List, record kew-151119.