Asterionella formosa var. gracillima (Hanztsch) Grunow, 1881 accepted as Diatoma gracillimum Hantzsch in Rabenhorst, 1861 (new combination reference)
Coscinodiscus pellucidus Grunow in Van Heurck, 1883 (original description)
Cyclotella comta var. radiosa Grunow in Van Heurck, 1882 (original description)
Cymbella tumida (Brébisson) van Heurck, 1880 accepted as Cocconema tumidum f. tumidum Brébisson ex Kützing, 1849 (new combination reference)
Ditylum brightwellii (T.West) Grunow, 1885 (new combination reference)
Eunotia incisa W.Smith ex W.Gregory, 1854 (original description)
Gomphonema arcticum Grunow, 1880 (original description)
Hemiaulus hauckii Grunow ex Van Heurck, 1882 (original description)
Mastogloia elliptica (C.Agardh) Cleve, 1893 (new combination reference)
Melosira hyperborea Grunow, 1882 (original description)
Navicula minuscula var. bahusiensis Grunow, 1880 (original description)
Navicula minuscula var. minuscula Grunow, 1880 (original description)
Navicula perminuta Grunow, 1880 (original description)
Plagiogramma vanheurckii Grunow, 1881 (original description)
Plagiotropis vanheurckii Grunow, 1883 (original description)
Rhizosolenia alata f. gracillima (Cleve) Gran, 1908 accepted as Rhizosolenia gracillima Cleve, 1881 (new combination reference)
Stephanodiscus astraea var. minutula (Kützing) Grunow, 1882 accepted as Cyclotella minutula Kützing, 1844 † (new combination reference)
Synedra delicatissima var. angustissima Grunow, 1881 (original description)
Tabellaria fenestrata var. asterionelloides Grunow, 1881 (original description)