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| Achnanthes lanceolata f. pura Mayer 1917 |
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| Achnanthes lanceolata f. semipura Mayer 1917 |
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| Achnanthes lanceolata f. typica Mayer 1917 |
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| Caloneis fasciata var. undulata Mayer 1917 |
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| Caloneis silicula var. gibba Mayer 1917 |
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| Caloneis silicula var. subgibba Mayer 1917 |
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| Caloneis silicula var. subundulata (Grunow in Cleve & Grunow) Mayer 1917 |
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| Caloneis silicula var. subundulata (Grunow in Cleve & Grunow) Mayer 1917 |
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| Cymbella bipartita Mayer 1917 |
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| Cymbella ventricosa var. laevis (Naegeli in Rabenhorst) Mayer 1917 |
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| Epithemia zebra var. tenuirostris Mayer 1917 |
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| Eunotia formica var. subparallela Mayer 1917 |
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| Eunotia major (maius) (maior) f. curta Mayer 1917 |
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| Eunotia nymanniana var. inflata Mayer 1917 |
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| Eunotia paludosa f. incisa Mayer 1917 |
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| Eunotia paludosa var. lunata Mayer 1917 |
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| Eunotia pectinalis f. biconstricta (Grunow in Van Heurck) Mayer 1917 |
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| Eunotia pectinalis var. bidens Mayer 1917 |
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| Eunotia pectinalis var. cymbelloides Mayer 1917 |
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| Eunotia pectinalis f. triundulata (Grunow in Rabenhorst; Rabenhorst) Mayer 1917 |
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