Comment:
the name A. alnobetula (Ehrh.) K. Koch, based on Betula alnobetula Ehrh. (1783) has priority over A. viridis (Chaix) DC., based on B. viridis Chaix (1786); nevertheless, A. viridis is retained here, as this infraspecific taxon is not yet accounted for under A. alnobetula