Campylodiscus spiralis (Kützing) R.Gutwinski, 1891 accepted as
Surirella spiralis f. spiralis Kützing, 1844 (new combination reference)
Navicula rhynchocephala f. schumanni Gutwinski, 1891 (original description)
Navicula tumida var. anglica (Ralfs) Gutwinski, 1891 accepted as
Navicula anglica f. anglica Ralfs in Pritchard, 1861 (new combination reference)
Nitzschia amphioxys var. genuina Gutwinski, 1891 (original description)
Orthosira arenaria var. typica Gutwinski, 1891 (original description)
Pinnularia gibba var. peckii (Rabenhorst) Mayer, 1913 accepted as
Stauroptera peckii Rabenhorst, 1853 (new combination reference)
Pinnularia mesolepta f. stauroneiformis (Grunow) Gutwinski, 1891 accepted as
Navicula mesolepta var. stauroneiformis Grunow, 1860 (new combination reference)
Pinnularia mesolepta var. constricta (Grunow) Mayer, 1913 accepted as
Navicula mesolepta var. constricta Grunow, 1860 (new combination reference)
Pinnularia mesolepta var. producta (Grunow) Gutwinski, 1891 accepted as
Navicula mesolepta var. producta Grunow, 1860 (new combination reference)
Pinnularia oblonga var. lanceolata (Grunow) Mayer, 1913 accepted as
Navicula oblonga var. lanceolata Grunow, 1860 (new combination reference)
Pinnularia stauroptera var. gracilis (Grunow) Gutwinski, 1891 accepted as
Navicula stauroptera var. gracilis Grunow, 1860 (new combination reference)
Synedra capitata var. hastata (Rabenhorst) Gutwinski, 1891 accepted as
Synedra hastata Rabenhorst, 1864 (new combination reference)
Synedra capitata var. typica Gutwinski, 1891 (original description)
Synedra sceptrum var. mesolepta Gutwinski, 1892 (1893) (original description)