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| Caloneis silicula var. inflata (Grunow) Mayer 1913 |
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| Cymbella tumida var. genuina (Grunow) Mayer 1913 |
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| Diatoma anceps var. longissima (Grunow) Mayer 1913 |
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| Eunotia lunaris var. genuina (Grunow) Mayer 1913 |
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| Nitzschia amphioxys var. intermedia (Grunow) Mayer 1913 |
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| Nitzschia amphioxys var. pusilla (Grunow) Mayer 1913 |
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| Pinnularia mesolepta var. constricta (Grunow) Mayer 1913 |
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| Pinnularia oblonga var. acuminata (Grunow) Mayer 1913 |
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| Pinnularia oblonga var. genuina (Grunow) Mayer 1913 |
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| Pinnularia oblonga var. lanceolata (Grunow) Mayer 1913 |
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| Pinnularia stauroptera f. parva (Grunow) Mayer 1913 |
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| Rhopalodia gibba var. genuina (Grunow) Mayer 1913 |
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| Rhopalodia gibberula var. genuina (Grunow) Mayer 1913 |
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| Rhopalodia gibberula var. producta (Grunow) Mayer 1913 |
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| Nitzschia amphioxys var. elongata (Hantzsch) Mayer 1913 |
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| Cymbella ventricosa f. minuta (Hilse in Rabenhorst) Mayer 1913 |
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| Stenopterobia intermedia var. bleischii (Janisch) Mayer 1913 |
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| Surirella ovalis f. aequalis (Kutzing ex Van Heurck) Mayer 1913 |
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| Caloneis silicula var. gibberula (Kützing) Mayer 1913 |
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| Caloneis silicula subsp. limosa (Kützing) Mayer 1913 |
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