Campyloneis costata (Gregory) Lagerstedt, 1876 accepted as Cocconeis costata var. costata Gregory, 1855 (new combination reference)
Grammatophora islandica var. hamulifera (Kützing) Lagerstedt, 1876 accepted as Grammatophora hamulifera var. hamulifera Kützing, 1844 (new combination reference)
Melosira maculata Lagerst., 1876 accepted as Podosira maculata W.Smith, 1856 (new combination reference)
Melosira montagnei var. montagnei (Kützing) Lagerstedt, 1876 accepted as Podosira montagnei var. montagnei Kützing, 1844 (new combination reference)
Navicula bombus var. alpha Lagerstedt, 1876 (original description)
Navicula bombus var. beta Lagerstedt, 1876 (original description)
Navicula brevis var. beta Lagerstedt, 1876 (original description)
Navicula brevis var. gamma Lagerstedt, 1876 (original description)
Navicula didyma sensu Lagerstedt, 1876 (original description)
Navicula impressa Lagerstedt in A. Schmidt, 1876 (original description)
Navicula schmidtii var. schmidtii Lagerstedt, 1876 (original description)
Nitzschia lata var. elegans Lagerstedt, 1876 (original description)
Nitzschia lata var. lata (Witt) Lagerstedt, 1876 accepted as Tryblionella lata Witt, 1873 accepted as Psammodictyon panduriforme var. latum (O.N. Witt) Louvrou & Economou-Amilli (new combination reference)
Orthoneis punctatissima f. minor Lagerstedt, 1876 (original description)
Orthoneis punctatissima f. punctatissima (Greville) Lagerstedt, 1876 accepted as Cocconeis punctatissima Greville, 1857 (new combination reference)
Sceptroneis marina f. marina (Gregory) Lagerstedt, 1876 accepted as Meridion marinum Gregory, 1857 (new combination reference)
Stauroneis scandinavica Lagerst., 1876 (original description)
Synedra arcus sensu Lagerstedt, 1876 (original description)
Synedra gracilis sensu Lagerstedt, 1876 (original description)