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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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| Navicula silicula var. inflata (Grunow) Prochazka 1923 |
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| Navicula silicula var. linearis (Grunow) Prochazka 1923 |
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| Tryblionella tryblionella (Hantzsch in Rabenhorst) Prochazka 1923 |
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| Navicula appendiculata var. silesiaca (Hustedt) Prochazka 1923 |
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| Navicula borealis var. brevicostata (Hustedt) Prochazka 1923 |
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| Navicula producta var. constricta (Hustedt) Prochazka 1923 |
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| Navicula silicula var. tumida (Hustedt) Prochazka 1923 |
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| Navicula viridis var. interrupta (Hustedt) Prochazka 1923 |
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| Navicula subcapitata var. hilseana (Janisch in Hilse; Janisch in Rabenhorst) Prochazka 1923 |
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| Navicula brebissonii var. linearis (Otto Müller) Prochazka 1923 |
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| Navicula microstauron var. biundulata (Otto Müller) Prochazka 1923 |
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| Navicula microstauron var. ornata (Otto Müller) Prochazka 1923 |
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| Navicula microstauron var. semicruciata (Otto Müller) Prochazka 1923 |
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| Navicula subcapitata var. subundulata (Otto Müller) Prochazka 1923 |
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| Navicula paucicostata (Rabenhorst) Prochazka 1923 |
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| Odontidium hiemale (hyemale) var. minor (Rabenhorst) Proschazka 1923 |
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| Odontidium hiemale (hyemale) var. rotundata (Rabenhorst) Proschazka 1923 |
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| Meridion circulare var. bicapitata (Schonfeldt) Prochazka 1923 |
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| Tryblionella tryblionella var. levidensis (W. Smith) Prochazka 1923 |
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| Navicula borealis var. peckii Grunow ex Prochazka 1923 |
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| Stauroneis obtusa f. parva Grunow ex Prochazka 1923 |
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| Triceratium irregulare var. tabellata Grunow 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 divergens f. major (maior) Zacharias ex Prochazka 1923 |
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