Nitzschia angularis f. minor Peragallo & Peragallo, 1900 (original description)
Nitzschia armoricana Peragallo & Peragallo, 1900 (original description)
Nitzschia clevei (Grunow in Cleve & Grunow) Peragallo & Peragallo, 1900 accepted as
Gomphonitzschia clevei Grunow, 1880 (new combination reference)
Nitzschia insignis var. niceaensis Peragallo & Peragallo, 1900 (original description)
Nitzschia lanceolata var. incrassata Peragallo & Peragallo, 1900 (original description)
Nitzschia lanceolata var. minima Peragallo & Peragallo, 1900 (original description)
Nitzschia lanceolata var. minor Van Heurck (new combination reference)
Nitzschia linearis f. brevis Peragallo & Peragallo, 1900 (original description)
Nitzschia linearis var. salinarum Peragallo & Peragallo, 1900 (original description)
Nitzschia rigida var. rigida (Kützing) Peragallo & Peragallo, 1900 accepted as
Amphipleura rigida Kützing, 1844 (new combination reference)
Nitzschia rigida var. rigidula Peragallo & Peragallo, 1900 (original description)
Nitzschia tenuissima H.Peragallo & M.Peragallo, 1900 (original description)
Nitzschia weissflogii var. glabrata Grunow in Peragallo & Peragallo, 1900 (original description)
Nitzschiella incerta (Grunow in Cleve & Grunow) Peragallo & Peragallo, 1900 accepted as
Nitzschia lorenziana var. incerta Grunow in Cleve & Grunow, 1880 (new combination reference)
Nitzschiella incurva var. incurva (Grunow) Peragallo & Peragallo, 1900 accepted as
Nitzschia incurva var. incurva Grunow, 1878 (new combination reference)
Nitzschiella longissima f. parva Peragallo & Peragallo, 1900 (original description)
Nitzschiella longissima f. typica Peragallo & Peragallo, 1900 (original description)
Nitzschiella longissima var. reversa Peragallo & Peragallo, 1900 (original description)
Nitzschiella lorensiana var. lorensiana (Grunow in Cleve & Moller; Grunow in Cleve & Grunow) Peragallo & Peragallo, 1900 accepted as
Nitzschia lorenziana var. lorenziana Grunow in Cleve & Möller, 1879 (new combination reference)
Nitzschiella lorensiana var. subtilis (Grunow in Cleve & Grunow) Peragallo & Peragallo, 1900 (new combination reference)
Rhopalodia gibba f. ventricosa (Kützing) Hustedt, 1957 accepted as
Epithemia ventricosa Kützing, 1844 (new combination reference)
Rhopalodia gibba var. parallela (Grunow) Holmboe, 1899 accepted as
Epithemia gibba var. parallela Grunow, 1862 accepted as
Epithemia parallela (Grunow) Ruck & Nakov (new combination reference)
Rhopalodia musculus var. constricta (W.Smith) H. & M.Peragallo, 1900 (new combination reference)
Rhopalodia musculus var. gibberula (Ehrenberg) Peragallo & Peragallo, 1900 accepted as
Eunotia gibberula Ehrenberg, 1843 (new combination reference)
Rhopalodia musculus var. producta (Grunow) Peragallo & Peragallo, 1900 accepted as
Epithemia gibberula var. producta Grunow, 1862 (new combination reference)
Rhopalodia succincta (Brebisson) Peragallo & Peragallo, 1900 (new combination reference)
Synedra crystallina var. conspicua Grunow ex H. Peragallo & M. Peragallo, 1900 (original description)
Synedra fulgens var. gigantea (Lobarzewsky) Peragallo & Peragallo, 1900 (new combination reference)
Synedra gaillonii var. elongata Peragallo & Peragallo, 1900 (original description)
Synedra hennedyana var. insignis Peragallo & Peragallo, 1900 (original description)
Synedra laevigata f. minor obtusa Peragallo & Peragallo, 1900 (original description)