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| Epithemia gibberula var. vanheurckii (van heurckii) (Otto Müller) Frenguelli 1924 |
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| Epithemia zebra var. elongata Grunow ex Frenguelli 1924 |
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| Epithemia zebra f. minor Frenguelli 1924 |
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| Eunotia praerupta var. tridentata (Ehrenberg) Frenguelli 1924 |
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| Fragilaria pinnata var. lapponica (Grunow in Van Heurck) Frenguelli 1924 |
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| Fragilaria pinnata var. minor Frenguelli 1924 |
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| Fragilaria pinnata var. perlonga Frenguelli 1924 |
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| Gomphonema candelariae Frenguelli 1924 |
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| Gomphonema candelariae var. elliptica Frenguelli 1924 |
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| Gomphonema candelariae var. minor Frenguelli 1924 |
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| Gomphonema constrictum var. clavata (Ehrenberg) Frenguelli 1924 |
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| Gomphonema olivaceum f. vulgaris (Kützing) 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 affinis f. minor Frenguelli 1924 |
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| Navicula charcotii var. magellanica Frenguelli 1924 |
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| Navicula cuspidata sensu Frenguelli 1924 |
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| Navicula cuspidata sensu Frenguelli 1924 |
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| Navicula cuspidata f. craticula Frenguelli 1924 |
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| Navicula cuspidata var. major Frenguelli 1924 |
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