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| Caloneis bacillaris f. semiinterrupta Cleve-Euler 1932 |
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| Caloneis fontinalis (Grunow in Van Heurck) Cleve-Euler 1932 |
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| Caloneis schilberszkyi var. gibba (Pantocsek) Cleve-Euler 1932 |
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| Caloneis silicula f. diminuta Cleve-Euler 1932 |
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| Caloneis silicula var. gibberula (Kützing) Cleve-Euler 1932 |
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| Caloneis silicula f. lata Cleve-Euler 1932 |
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| Caloneis silicula var. ventricosa Cleve-Euler 1932 |
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| Caloneis toussiengii Cleve-Euler 1932 |
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| Campylodiscus hibernicus var. sublaevis (Meister) Cleve-Euler 1932 |
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| Cyclotella meneghiniana var. rectangulata Cleve-Euler 1932 |
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| Cyclotella operculata var. ocellata (Pantocsek) Cleve-Euler 1932 |
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| Cymatopleura elliptica var. angulata (Greville) Cleve-Euler 1932 |
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| Cymatopleura elliptica var. brunii Cleve-Euler 1932 |
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| Cymatopleura elliptica f. imperfecta Cleve-Euler 1932 |
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| Cymatopleura solea f. reducta Cleve-Euler 1932 |
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| Cymbella amphicephala var. differta Cleve-Euler 1932 |
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| Cymbella amphicephala var. intermedia Cleve-Euler 1932 |
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| Cymbella austriaca var. reducta Cleve-Euler 1932 |
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| Cymbella austriaca var. subrhomboidea (Østrup) Cleve-Euler 1932 |
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| Cymbella austriaca var. ventricosa Cleve-Euler 1932 |
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