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| Cyclotella operculata f. rectangula Kützing according to Mills 1934 |
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| Cyclotella operculata var. rectangulata Kützing according to Mills 1934 |
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| Cymatogonia annulata (Wallich) F.W. Mills 1934 |
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| Cymatopleura solea var. gracilis (Pantocsek) F.W. Mills 1934 |
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| Cymbella affinis f. excisa (Kützing) Grunow according to Mills 1934 |
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| Cymbella alpina var. minor (Brun & Héribaud in Héribaud) Mills 1934 |
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| Cymbella avenica 'Brébisson' Mills 1934 |
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| Cymbella boeckii (Grunow in Schmidt et al.) F.W. Mills 1934 |
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| Cymbella florentina (Grunow in Van Heurck) F.W. Mills 1934 |
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| Cymbella florentina f. ceylonica (Skvortzow) F.W. Mills 1934 |
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| Cymbella grandi (Héribaud) F.W. Mills 1934 |
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| Cymbella grossestriata var. tanganyikae (G.S. West) F.W. Mills 1934 |
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| Cymbella helvetica var. hungarica (Pantocsek) F.W. Mills 1934 |
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| Cymbella inaequalis "W. Smith in Greville 1855" according to Mills 1934 |
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| Cymbella intermedia (Héribaud) F.W. Mills 1934 |
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| Cymbella martyi (Héribaud) F.W. Mills 1934 |
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| Cymbella nana (Hantzsch in Rabenhorst) F.W. Mills 1934 |
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| Denticula elegans var. ocellata (W. Smith) Mills 1934 |
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| Diatoma boulei var. fossilis (Lauby) F.W. Mills 1934 |
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| Diatoma boulei var. mesodon (Lauby) F.W. Mills 1934 |
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