Achnanthes delicatula var. robusta Hustedt, 1934 (original description)
Achnanthes exigua var. capitata Hustedt, 1934 (original description)
Achnanthes kryophila var. densestriata Hustedt, 1934 (original description)
Achnanthes subexigua Hustedt, 1934 (original description)
Epithemia zebra var. intermedia (Fricke) Hustedt, 1934 accepted as
Epithemia intermedia Fricke, 1904 (new combination reference)
Navicula brockmanni var. brockmanni Hustedt, 1934 (original description)
Navicula declivis Hustedt, 1934 (original description)
Navicula hustedtii var. obtusa Hustedt, 1934 (original description)
Navicula lagerheimii var. palustris Hustedt, 1934 (original description)
Navicula subcostulata var. subcostulata Hustedt, 1934 (original description)
Navicula subfossalis Hustedt, 1934 (original description)
Nitzschia palustris Hustedt, 1934 (original description)
Nitzschia terrestris (J.B.Petersen) Hustedt, 1934 accepted as
Nitzschia vermicularis var. terrestris J.B.Petersen, 1928 (new combination reference)
Pinnularia lagerstedti (Cleve) Hustedt, 1934 accepted as
Pinnularia parva f. lagerstedtii Cleve, 1895 (new combination reference)
Stauroneis montana var. lanceolata F.Hustedt, 1934 (original description)