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| Navicula patagonica var. schmidtii Frenguelli 1924 |
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| Navicula peragalli Frenguelli 1924 |
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| Navicula peragalli var. gracilis Frenguelli 1924 |
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| Navicula subcapitata var. hybrida (Grunow in Van Heurck) Frenguelli 1924 |
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| Navicula viridis var. lata Frenguelli 1924 |
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| Navicula viridis var. transversa (Schmidt in Schmidt et al.) Frenguelli 1924 |
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| Nitzschia amphioxys var. arverna (M. Peragallo in Heribaud et al.) Frenguelli 1924 |
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| Nitzschia amphioxys var. capitellata (Grunow in Cleve & Grunow) Frenguelli 1924 |
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| Nitzschia amphioxys var. hyperborea (Grunow) Frenguelli 1924 |
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| Nitzschia amphioxys var. minor (Peragallo & Peragallo) Frenguelli 1924 |
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| Nitzschia elongata var. linearis (Otto Müller) Frenguelli 1924 |
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| Nitzschia elongata var. linearis (Otto Müller) Frenguelli 1924 |
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| Nitzschia panduriformis var. parva Frenguelli 1924 |
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| Nitzschia subtilis var. acicularis Frenguelli 1924 |
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