Amphiprora paludosa var. duplex Donkin accepted as Amphiprora duplex var. duplex Donkin, 1858 (new combination reference)
Amphora angularis var. hybrida Grunow, 1885 (original description)
Bellerochea H. Van Heurck, 1885 (original description)
Campylosira A. Grunow ex H. Van Heurck, 1885 (original description)
Coscinodiscus rothii var. normani (Gregory ex Greville) Van Heurck, 1928 accepted as Coscinodiscus normanii Gregory ex Greville, 1859 (new combination reference)
Cymbella cistula var. maculata (Kützing) Van Heurck, 1885 accepted as Frustulia maculata Kützing, 1833 (new combination reference)
Cymbella microcephala Grunow in Van Heurck, 1885 accepted as Encyonopsis microcephala (Grunow) Krammer, 1997 (original description)
Diatoma elongatum var. hybrida (Grunow) Cleve-Euler, 1912 accepted as Diatoma tenue var. hybrida Grunow in Van Heurck, 1881 (new combination reference)
Diatoma elongatum var. tenuis (C.A. Agardh) Van Heurck, 1885 accepted as Diatoma tenue C. Agardh, 1812 (new combination reference)
Fragilaria brevistriata f. brevistriata Grunow in Van Heurck, 1885 (original description)
Micropodiscus A. Grunow in H. Van Heurck, 1885 accepted as Conticribra K. Stachura-Suchoples & D.M. Williams, 2009 (original description)
Micropodiscus weissflogii Grunow, 1885 accepted as Conticribra weissflogii (Grunow) K.Stachura-Suchoples & D.M.Williams, 2009 † (new combination reference)
Navicula cuspidata var. halophila Grunow, 1885 (original description)
Navicula liburnica var. liburnica Grunow in Van Heurck, 1885 (original description)
Navicula radiosa var. tenella (Brébisson ex Kützing) Van Heurck, 1885 accepted as Navicula tenella var. tenella Brebisson in Kutzing, 1849 (new combination reference)
Navicula viridula var. avenacea (Brébisson) van Heurck, 1885 accepted as Pinnularia radiosa Rabenhorst, 1853 (new combination reference)
Nitzschia frustulum var. perpusilla (Rabenhorst) Van Heurck, 1885 accepted as Nitzschia perpusilla f. perpusilla Rabenhorst, 1861 (new combination reference)
Nitzschia microcephala var. elegantula (Grunow) van Heurck, 1885 accepted as Nitzschia elegantula Grunow, 1881 (new combination reference)
Nitzschia obtusa var. nana Grunow, 1885 (original description)
Synedra acus var. angustissima (Grunow) van Heurck, 1885 accepted as Synedra delicatissima var. mesoleia Grunow in Van Heurck, 1881 (new combination reference)
Synedra affinis var. fasciculata (C.A. Agardh) Grunow in Van Heurck, 1881 (new combination reference)
Synedra affinis var. tabulata (C.Agardh) Grunow in Van Heurck, 1881 accepted as Tabularia tabulata (C.Agardh) Snoeijs, 1992 (new combination reference)