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| Navicula divergens var. parallela (Brun) Frenguelli 1924 |
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| Navicula lata var. latestriata (Gregory) Frenguelli 1924 |
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| Nitzschia amphioxys var. capitellata (Grunow in Cleve & Grunow) Frenguelli 1924 |
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| Navicula subcapitata var. hybrida (Grunow in Van Heurck) Frenguelli 1924 |
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| Eunotia praerupta f. inflata (Grunow) Frenguelli 1924 |
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| Melosira sulcata var. crenulata (Grunow) Frenguelli 1924 |
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| Nitzschia amphioxys var. hyperborea (Grunow) Frenguelli 1924 |
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| Nitzschia amphioxys var. arverna (M. Peragallo in Heribaud et al.) 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 amphioxys var. minor (Peragallo & Peragallo) Frenguelli 1924 |
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| Navicula viridis var. transversa (Schmidt in Schmidt et al.) Frenguelli 1924 |
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| Achnanthes delicatula var. magellanica Frenguelli 1924 |
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| Actinoptychus undulatus f. quaternata Frenguelli 1924 |
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| Actinoptychus undulatus f. ternata Frenguelli 1924 |
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| Epithemia zebra Frenguelli 1924 |
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| Fragilaria construens var. minor Frenguelli 1924 |
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| Fragilaria construens var. tetragona Frenguelli 1924 |
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| Fragilaria pinnata f. brevistriata Frenguelli 1924 |
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| Fragilaria pinnata f. minor Frenguelli 1924 |
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