Eunotia bilunaris (Ehrenberg) Schaarschmidt, 1880 accepted as Synedra bilunaris var. bilunaris Ehrenberg, 1832 (new combination reference)
Frustulia viridula (Brébisson) Schaarschmidt, 1881 accepted as Colletonema viridulum Brébisson ex Kützing, 1849 (new combination reference)
Neidium linearis (Grunow) M.Brun accepted as Navicula linearis Grunow, 1860 (new combination reference)
Odontidium tenue var. elongatum Lyngbye Schaarschmidt (original description)
Odontidium tenue var. irregulare Schaarschmidt (original description)
Odontidium tenue var. minus (Grunow) Schaarschmidt accepted as Diatoma tenue var. minus Grunow, 1862 (new combination reference)
Odontidium tenue var. normale (Kützing) Schaarschmidt (original description)
Pinnularia appendiculata (C.Agardh) Schaarschmidt, 1881 accepted as Frustulia appendiculata C.Agardh, 1827 (new combination reference)
Pinnularia parva (Ehrenberg) Schaarschmidt, 1881 accepted as Stauroptera parva Ehrenberg, 1843 (new combination reference)
Pinnularia sublinearis (Grunow) Schaarschmidt, 1881 accepted as Navicula sublinearis Grunow, 1885 (new combination reference)
Podosphenia communis var. cuneata (Lyngbye) Schaarschmidt accepted as Podosphenia cuneata (Lyngbye) Ehrenberg (new combination reference)
Synedra caroliprincipis Istvanffi (Schaarschmidt), 1881 (original description)
Synedra schaarschmidtii var. alessiana Schaarschmidt (original description)
Synedra schaarschmidtii var. schaarschmidtii Kanitz in Istvanffi (Schaarschmidt), 1881 (original description)
Synedra ulna var. salina (W.Smith) W.Smith accepted as Synedra salina W. Smith, 1853 accepted as Ulnaria salina (W. Sm.) Gogorev, 2018 (new combination reference)