Achnanthes krejcii Hustedt, 1950 (original description)
Achnanthes lanceolata var. bimaculata Hustedt, 1950 (original description)
Achnanthes lauenburgiana Hustedt, 1950 (original description)
Cymbellonitzschia diluviana Hustedt, 1950 (original description)
Eunotia rhomboidea Hustedt, 1950 (original description)
Fragilaria capucina var. gracilis (Østrup) Hustedt, 1950 accepted as
Fragilaria gracilis Østrup, 1910 (new combination reference)
Gomphonema olivaceoides var. olivaceoides Hustedt, 1950 (original description)
Navicula absoluta Hustedt, 1950 (original description)
Navicula acceptata Hustedt, 1950 † (original description)
Navicula accommoda Hustedt in Messikommer, 1950 (original description)
Navicula accurata Hustedt, 1950 (original description)
Navicula difficillima Hustedt, 1950 (original description)
Navicula gracilis f. minutissima Hustedt, 1950 (original description)
Navicula lenzii Hustedt, 1936 (original description)
Navicula limatoides Hustedt, 1950 (original description)
Navicula lucinensis Hustedt, 1950 (original description)
Navicula muraloides Hustedt, 1950 (original description)
Navicula opportuna Hustedt, 1950 (original description)
Navicula ordinaria Hustedt, 1950 (original description)
Navicula perhibita Hustedt, 1950 (original description)
Navicula protracta sensu Hustedt, 1950 (original description)
Navicula pseudomitis Hustedt, 1950 (original description)
Navicula quadripuctata Hustedt, 1950 (original description)
Navicula sublucidula Hustedt, 1950 (original description)
Neidium affine var. lucinensis Hustedt, 1950 (original description)
Neidium dubium var. elongata Hustedt, 1950 (original description)
Neidium iridis var. obtusa Hustedt, 1950 (original description)
Nitzschia garrensis Hustedt, 1950 (original description)
Nitzschia lauenburgiana Hustedt, 1950 (original description)
Nitzschia paleaeformis Hustedt, 1950 (original description)
Nitzschia radicula var. rostrata Hustedt, 1950 (original description)
Nitzschia recta var. robusta Hustedt, 1950 (original description)
Nitzschia subinvicta Hustedt, 1950 (original description)
Nitzschia vacua Hustedt, 1950 (original description)
Oestrupia zachariasi (Reichelt) Hustedt, 1950 accepted as
Navicula zachariasi Reichelt, 1903 (new combination reference)
Pinnularia inculpata F.Hustedt, 1950 (original description)
Pinnularia interrupta var. gibberula Hustedt, 1950 (original description)
Pinnularia ruttneri var. lauenbergiana Hustedt, 1950 (original description)
Pinnularia subcapitata f. divergens F.Hustedt, 1950 (original description)
Stauroneis lauenburgiana f. angulata Hustedt, 1950 (original description)
Stauroneis lauenburgiana f. lauenburgiana Hustedt, 1950 (original description)