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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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| Meridion circulare var. bicapitata (Schonfeldt) Prochazka 1923 |
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| Navicula affinis var. longiceps (Gregory) Prochazka 1923 |
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| Navicula affinis f. minor (Cleve) Prochazka 1923 |
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| Navicula appendiculata var. silesiaca (Hustedt) Prochazka 1923 |
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| Navicula bisulcata var. undulata (Grunow) Prochazka 1923 |
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| Navicula borealis var. brevicostata (Hustedt) Prochazka 1923 |
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| Navicula borealis var. peckii Grunow ex Prochazka 1923 |
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| Navicula brebissonii var. linearis (Otto Müller) Prochazka 1923 |
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| Navicula divergens f. major (maior) Zacharias ex Prochazka 1923 |
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| Navicula genuflexa var. semicruciata Prochazka 1923 |
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| Navicula gracillima var. curta Prochazka 1923 |
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| Navicula hungarica var. bicapitata 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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| Navicula interrupta var. termes (Ehrenberg) Prochazka 1923 |
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| Navicula lata var. pachyptera (Ehrenberg) Prochazka 1923 |
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| Navicula lata var. rabenhorstii (Grunow) Prochazka 1923 |
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| Navicula microstauron var. biundulata (Otto Müller) Prochazka 1923 |
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