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| Navicula divergens var. parallela (Brun) Frenguelli 1924 |
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| Navicula magellanica (Cleve) Frenguelli 1924 |
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| Navicula magellanica (Cleve) Frenguelli 1924 |
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| Navicula minutissima (Cleve) Frenguelli 1924 |
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| Eunotia praerupta var. tridentata (Ehrenberg) Frenguelli 1924 |
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| Gomphonema constrictum var. clavata (Ehrenberg) Frenguelli 1924 |
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| Navicula affinis var. ampliata (Ehrenberg) Frenguelli 1924 |
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| Navicula affinis var. ampliata (Ehrenberg; Ehrenberg) Frenguelli 1924 |
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| Navicula lata var. latestriata (Gregory) Frenguelli 1924 |
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| Fragilaria pinnata var. lapponica (Grunow in Van Heurck) Frenguelli 1924 |
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| Navicula fasciata var. fontinalis (Grunow in Van Heurck) Frenguelli 1924 |
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| Gomphonema olivaceum f. vulgaris (Kützing) Frenguelli 1924 |
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| Navicula mutica (Kützing) Frenguelli 1924 |
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| Vanheurckia interposita var. incomperta (Lewis) Frenguelli 1924 |
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| Navicula mutica subsp. charcotii (M. Peragallo) Frenguelli 1924 |
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| Stauroneis boudetii (M. Peragallo) Frenguelli 1924 |
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| Epithemia gibberula var. vanheurckii (van heurckii) (Otto Müller) Frenguelli 1924 |
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| Navicula linearis (Otto Müller) Frenguelli 1924 |
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| Navicula silicula var. patagonia (Otto Müller) Frenguelli 1924 |
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| Navicula mutica subsp. muticopsis (Van Heurck) Frenguelli 1924 |
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