This name is a synonym of Alnus incana subsp. rugosa (Du Roi) R.T.Clausen.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 386893) with original publication details: Sp. Pl. 4: 335 1805.
This name was in version 1 of The Plant List, record kew-386893, and has not been changed.