Achnanthes clevei var. rostrata Hustedt, 1930 (original description)
Amphiprora costata Hustedt, 1930 accepted as Entomoneis costata (Hustedt) Reimer, 1975 (original description)
Diatoma vulgare var. ovalis (Fricke) Hustedt, 1930 accepted as Diatoma ovalis Fricke in Schmidt et al., 1906 (new combination reference)
Eunotia valida Hustedt, 1930 (original description)
Fragilaria brevistriata var. trigibba (Pantocsek) Hustedt, 1930 accepted as Fragilaria trigibba Pantocsek, 1902 (new combination reference)
Frustulia rhomboides f. capitata (Mayer) Hustedt, 1930 accepted as Frustulia saxonica var. capitata A.Mayer, 1917 (new combination reference)
Frustulia rhomboides f. undulata Hustedt, 1930 (original description)
Navicula graciloides A.Mayer, 1919 (original description)
Navicula grimmei Krasske, 1930 accepted as Dorofeyukea grimmei (Krasske in Hustedt) Kulikovskiy & Kociolek in Kulikovskiy et al., 2019 (original description)
Navicula krasskei Hustedt, 1930 (original description)
Navicula longirostris Hustedt, 1930 (original description)
Navicula placentula f. latiuscula (Grunow) F.Meister accepted as Navicula gastrum var. latiuscula Grunow, 1880 (new combination reference)
Navicula placentula f. rostrata (Mayer) Hustedt, 1930 accepted as Navicula placentula var. rostrata Mayer, 1918 (new combination reference)
Navicula pseudoscutiformis Hustedt, 1930 (original description)
Navicula pupula var. capitata Hustedt, 1934 (original description)
Navicula pupula var. elliptica Hustedt, 1911 (original description)
Navicula pupula var. mutata (Krasske) Hustedt, 1930 accepted as Navicula mutata var. mutata Krasske, 1929 (new combination reference)
Navicula schoenfeldii f. schoenfeldii Hustedt, 1930 (original description)
Navicula simplex Krasske, 1925 accepted as Craticula simplex (Krasske, 1925) Levkov, 2017 (original description)
Navicula thermicola J.B.Petersen, 1928 (original description)
Navicula tuscula f. minor Hustedt, 1930 (original description)
Navicula tuscula f. obtusa (Hustedt) Proschkina-Lavrenko, 1950 accepted as Navicula tuscula var. obtusa Hustedt, 1922 (new combination reference)
Navicula ventralis Krasske, 1923 (original description)
Navicula verecunda Hustedt, 1930 (original description)
Navicula vitabunda Hustedt, 1930 (original description)
Neidium dubium f. constricta (Hustedt) Hustedt, 1930 accepted as Neidium dubium var. constricta Hustedt, 1922 (new combination reference)
Nitzschia frustulum var. subsalina Hustedt, 1930 (original description)
Nitzschia gandersheimiensis Krasske, 1927 (original description)
Pinnularia viridis var. sudetica (Hilse) Hustedt, 1930 accepted as Navicula sudetica var. sudetica Hilse, 1860 (new combination reference)
Stauroneis phoenicenteron f. brevis (Dippel) Hustedt, 1930 (new combination reference)
Stephanodiscus dubius Hustedt, 1928 (original description)
Surirella ovata var. crumena (Brébisson) Hustedt, 1930 accepted as Surirella crumena Brébisson ex Kützing, 1849 (new combination reference)
Synedra parasitica var. subconstricta (Grunow) Hustedt, 1930 accepted as Fragilaria parasitica var. subconstricta Grunow, 1881 (new combination reference)