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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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