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| Pinnularia divergens var. parallela (Brun) Frenguelli 1933 |
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| Pinnularia stauroptera f. semicruciata (Cleve) Frenguelli 1933 |
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| Eunotia didyma var. pileus (Ehrenberg) Frenguelli 1933 |
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| Melosira italica var. laevis (Ehrenberg) Frenguelli 1933 |
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| Neidium iridis var. amphigomphus (Ehrenberg) Frenguelli 1933 |
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| Neidium iridis var. dubia (Ehrenberg) Frenguelli 1933 |
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| Pinnularia dactylus var. gigas (Ehrenberg) Frenguelli 1933 |
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| Neidium affine (affinis) var. ampliata (Ehrenberg; Ehrenberg) Frenguelli 1933 |
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| Achnanthes hungarica var. rivularia (Frenguelli) Frenguelli 1933 |
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| Hantzschia exilis (Frenguelli) Frenguelli 1933 |
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| Hantzschia limi (Frenguelli) Frenguelli 1933 |
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| Pinnularia clericii (Frenguelli) Frenguelli 1933 |
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| Pinnularia divergens var. laticeps (Frenguelli) Frenguelli 1933 |
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| Pinnularia latevittata var. spathulata (Frenguelli) Frenguelli 1933 |
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| Pinnularia viridis var. lata (Frenguelli) Frenguelli 1933 |
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| Gomphonema turris var. brasiliensis (Fricke in Schmidt et al.) Frenguelli 1933 |
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| Melosira italica var. semilaevis (Grunow in Van Heurck) Frenguelli 1933 |
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| Pinnularia microstauron var. subproducta (Grunow in Van Heurck) Frenguelli 1933 |
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| Pinnularia subcapitata var. hybrida (Grunow in Van Heurck) Frenguelli 1933 |
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| Eunotia formica f. elongata (Grunow) Frenguelli 1933 |
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