When established, additional several previously validly published fossil-species of Acer were included in synonymy: Acer productum A. Braun (in Neues Jahrb. Mineral. Geognosie, 1845, (2): 172. 1845); Acer protensum A. Braun (in Stizenb. Uebers. Verstein. Baden 84. 7-10 May 1851); Acerites deperditus A. Massal. (in Nuovi Ann. Sci. Nat. Rendiconto Sess. Soc. Agrar., Serie 3, 8(Settembre-Ottobre): 197. 10 Dec 1853); Platanus cuneifolia Goepp. (Tert. Fl. Schossnitz 22. 1-2 Mar 1855).