Cyclotella atomus Hustedt, 1937 (original description)
Cyclotella stelligera var. tenuis Hustedt, 1937 (original description)
Eunotia dissimilis Hustedt in Schmidt et al., 1933 (original description)
Eunotia exigua var. gibba Hustedt, 1938 (original description)
Eunotia recurvata (Hustedt in Schmidt et al.) Hustedt, 1938 accepted as
Eunotia didyma var. recurvata Hustedt in Schmidt et al., 1933 (new combination reference)
Eunotia similis Hustedt in Schmidt et al., 1933 (original description)
Eunotia thienemannii Hustedt, 1938 (original description)
Hydrosera triquetra var. hexagona Hustedt, 1937 (original description)
Melosira cataractarum f. cataractarum Hustedt, 1937 (original description)
Melosira ruttneri Hustedt, 1937 accepted as
Angusticopula robusta (Hustedt) Houk et al., 2017 (original description)
Synedra rumpens f. constricta Hustedt, 1937 (original description)
Synedra rumpens var. neogena (Grunow) Hustedt, 1937 accepted as
Synedra familiaris var. neogena Grunow, 1882 (new combination reference)
Synedra ulna f. fonticola Hustedt, 1937 (original description)
Synedra ulna var. claviceps Hustedt, 1937 (original description)
Synedra ulna var. fonticola Hustedt, 1937 (original description)
Synedra ulna var. tenuirostris Hustedt, 1937 (original description)