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| Navicula silicula var. kjellmanniana (kjellmaniana) (Cleve in Cleve & Grunow) Prochazka 1923 |
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| Navicula affinis f. minor (Cleve) Prochazka 1923 |
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| Navicula silicula var. genuina (Cleve) Prochazka 1923 |
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| Gomphonema acuminatum var. nasuta (nasutum) (Ehrenberg) Prochazka 1923 |
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| Hantzschia dianae (Ehrenberg) Prochazka 1923 |
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| Navicula interrupta var. termes (Ehrenberg) Prochazka 1923 |
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| Navicula lata var. pachyptera (Ehrenberg) Prochazka 1923 |
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| Navicula silicula var. ventricosa (Ehrenberg) Prochazka 1923 |
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| Navicula stauroptera var. mesogongyla (Ehrenberg) Prochazka 1923 |
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| Navicula affinis var. longiceps (Gregory) Prochazka 1923 |
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| Navicula interrupta var. biceps (Gregory) Prochazka 1923 |
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| Navicula interrupta var. hybrida (Grunow ex Hofmann) Prochazka 1923 |
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| Tryblionella tryblionella var. calida (Grunow in Cleve & Grunow; Grunow in Van Heurck) Prochazka 1923 |
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| Tryblionella tryblionella var. littoralis (Grunow in Cleve & Grunow; Grunow in Van Heurck) Prochazka 1923 |
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| Navicula serians f. minor (Grunow in Van Heurck) Prochazka 1923 |
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| Navicula silicula var. minuta (Grunow in Van Heurck) Prochazka 1923 |
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| Navicula silicula var. truncatula (Grunow in Van Heurck) Prochazka 1923 |
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| Navicula silicula var. undulata (Grunow in Van Heurck) Prochazka 1923 |
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| Navicula bisulcata var. undulata (Grunow) Prochazka 1923 |
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| Navicula lata var. rabenhorstii (Grunow) Prochazka 1923 |
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