This name is a synonym of Nothofagus fusca var. colensoi (Hook.f.) Cheeseman.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 83821) with original publication details: Fl. Nov.-Zel. 1: 229 1853.
This name was in version 1 of The Plant List, record kew-83821, and has not been changed.