Amphiprora kjellmanii var. genuina Gran in Nansen, 1900 (original description)
Amphiprora kjellmanii var. kryophila (Cleve) Gran, 1903-1906 accepted as
Amphiprora kryophila Cleve, 1883 (new combination reference)
Chaetoceros teres f. spinulosus Gran, 1904 (original description)
Chaetoceros teres f. spumosa Gran, 1900 (original description)
Navicula blessingii Gran, 1900 (original description)
Navicula derasa var. erosa (Cleve) Gran, 1900 accepted as
Navicula erosa var. erosa Cleve, 1883 (new combination reference)
Navicula detersa Grunow in Cleve, 1883 accepted as
Navicula kariana var. detersa Grunow, 1884 (new combination reference)
Navicula recurvata Gran, 1900 (original description)
Navicula superba var. subacuta Gran, 1900 (original description)
Navicula transfuga f. robusta Gran, 1900 (original description)
Pinnularia perlucens (E.V.Østrup) H.H.Gran accepted as
Navicula perlucens Østrup, 1895 (new combination reference)
Pinnularia quadratarea f. cuneata (Østrup) Gran, 1900 accepted as
Navicula stuxbergii var. cuneata Østrup, 1895 (new combination reference)
Pinnularia quadratarea f. denestriata (Cleve) Gran, 1900 accepted as
Pinnularia quadratarea var. densestriata Cleve, 1896 (new combination reference)
Pinnularia quadratarea f. gibbosa (Østrup) Gran, 1900 accepted as
Navicula pinnularia var. gibbosa Østrup, 1895 (new combination reference)
Pinnularia quadratarea f. maxima (Østrup) Gran, 1900 accepted as
Navicula pinnularia var. maxima Østrup, 1895 (new combination reference)
Pinnularia quadratarea f. minima (Østrup) Gran, 1900 (new combination reference)
Pinnularia quadratarea f. subcontinua (Grunow) Gran, 1900 accepted as
Navicula stuxbergii var. subcontinua Cleve, 1883 (new combination reference)
Pinnularia quadratarea f. subglabra (Østrup) Gran, 1900 accepted as
Navicula stuxbergii var. subglabra Østrup, 1895 (new combination reference)
Pinnularia quadratarea f. theelii (Cleve) Gran accepted as
Navicula theelii Cleve in Cleve & Grunow, 1880 (new combination reference)
Pinnularia quadratarea var. bicontracta (Østrup) Gran, 1900 accepted as
Navicula pinnularia var. bicontracta Østrup, 1895 (new combination reference)
Pinnularia quadratarea var. constricta (Østrup) Heiden, 1874 accepted as
Navicula pinnularia f. constricta Østrup, 1895 (new combination reference)
Pinnularia quatratarea f. leptostauron (Grunow) Gran, 1900 accepted as
Navicula stuxbergii var. leptostauron Cleve, 1883 (new combination reference)
Pinnularia quatratarea f. subconstricta (Østrup) Gran, 1900 accepted as
Navicula pinnularia var. subconstricta Østrup, 1895 (new combination reference)
Pinnularia semiinflata var. decipiens (Cleve) Gran, 1900 accepted as
Navicula decipiens Cleve, 1896 (new combination reference)
Pinnularia semiinflata var. genuina Gran, 1900 (original description)
Pinnularia semiinflata var. inaequalis (Østrup) Gran, 1900 accepted as
Navicula glacialis var. inaequalis Østrup, 1895 (new combination reference)
Pinnularia semiinflata var. semiinflata (Østrup) Gran, 1900 accepted as
Navicula semiinflata Østrup, 1895 (new combination reference)
Surirella oestrupi Gran, 1900 (original description)
Xanthiopyxis polaris Gran, 1900 † (original description)