This name is a synonym of Betula pubescens var. glabrata Wahlenb..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 21640) with original publication details: Fl. Nordostdeut. Flachl. 253 1898.
This name was in version 1 of The Plant List, record kew-21640.