Achnanthes andicola var. andicola (Cleve) Hust., 1911 accepted as
Achnanthes andicola (Cleve) Hust., 1911 accepted as
Lemnicola hungarica (Grunow) F.E.Round & P.W.Basson, 1997 accepted as
Achnanthidium hungaricum Grunow, 1863 (new combination reference)
Achnanthes lanceolata var. rostrata Hustedt, 1911 accepted as
Planothidium rostratoholarcticum Lange-Bertalot & Bąk in Bąk & Lange-Bertalot, 2014 (original description)
Caloneis schumanniana var. linearis Hustedt, 1911 (original description)
Cymbella minutissima Hustedt, 1911 (original description)
Eunotia pectinalis f. ventralis (Ehrenberg) Hustedt, 1957 accepted as
Eunotia ventralis Ehrenberg, 1843 (new combination reference)
Navicula integra var. truncata Hustedt, 1911 (original description)
Navicula lemmermanni Hustedt, 1911 (original description)
Navicula mutica var. nivalis (Ehrenberg) Hustedt, 1911 accepted as
Navicula nivalis var. nivalis Ehrenberg, 1853 (new combination reference)
Navicula placentula var. apiculata Hustedt, 1911 (original description)
Navicula pupula var. elliptica Hustedt, 1911 (original description)
Navicula pupula var. rostrata Hustedt, 1911 (original description)
Navicula pupula var. subcapitata Hustedt, 1911 (original description)
Navicula tuscula var. rostrata Hustedt, 1911 (original description)
Surirella apiculata var. apiculata Hustedt, 1911 (original description)
Surirella bifrons f. minor (Otto Müller) Hustedt, 1911 (new combination reference)
Surirella biseriata f. amphioxys (W. Smith) Hustedt, 1911 accepted as
Iconella amphioxys (W.Smith) D.Kapustin & O.Kryvosheia in Kryosheia & Kapustin, 2019 (new combination reference)
Surirella biseriata f. bifrons (Ehrenberg; Ehrenberg) Hustedt, 1911 accepted as
Navicula bifrons Ehrenberg, 1833 (new combination reference)
Surirella biseriata f. constricta Hustedt, 1911 (original description)
Surirella biseriata f. intermedia (Otto Müller) Hustedt, 1911 accepted as
Surirella bifrons var. intermedia Otto Müller, 1903 (new combination reference)
Surirella biseriata f. tumida (Otto Müller) Hustedt, 1911 accepted as
Surirella bifrons f. tumida Otto Müller, 1903 (new combination reference)
Surirella engleri f. africana (Otto Müller) Hustedt, 1911 (new combination reference)
Surirella engleri f. sublaevis (Otto Müller) Hustedt, 1911 (new combination reference)
Surirella fuellebornii f. genuina recta Hustedt, 1911 (original description)
Surirella fuellebornii f. maxima Hustedt, 1911 (original description)
Surirella fuellebornii var. maxima (Otto Müller) Hustedt, 1911 accepted as
Surirella constricta var. maxima Otto Müller, 1903 (new combination reference)
Surirella linearis f. hyalina (Lemmermann) Hustedt, 1911 accepted as
Surirella constricta var. hyalina Lemmermann, 1910 (new combination reference)
Surirella linearis f. lata Hustedt, 1911 (original description)
Surirella linearis f. lata (Otto Müller) Hustedt, 1911 (new combination reference)
Surirella linearis f. latior Hustedt, 1911 (original description)
Surirella linearis var. constricta Hustedt, 1911 (original description)
Surirella robusta f. punctata Hustedt, 1930 accepted as
Surirella splendida var. punctata Hustedt, 1909 (new combination reference)
Surirella tenera var. subconstricta Hustedt, 1911 (original description)
Synedra oxyrhynchus var. contracta Hustedt, 1911 (original description)