This name is a synonym of Betula pendula var. fontqueri (Rothm.) G.Moreno & Peinado.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 21586) with original publication details: Anales Jard. Bot. Madrid 45: 359 1988.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:954595-1.
This name was in version 1 of The Plant List, record kew-21586, and has not been changed.