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| Coscinodiscus subtilis f. grunowii Cleve-Euler 1951 |
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| Coscinodiscus subtilis f. inermis Cleve-Euler 1951 |
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| Coscinodiscus subtilis f. siberica (Grunow) Cleve-Euler 1951 |
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| Cyclotella bodanica var. affinis (Grunow in Van Heurck) Cleve-Euler 1951 |
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| Cyclotella bodanica f. borealis (Cleve-Euler) Cleve-Euler 1951 |
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| Cyclotella bodanica var. genuina Cleve-Euler 1951 |
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| Cyclotella comta var. binotata (Pantocsek) Cleve-Euler 1951 |
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| Cyclotella comta f. binotata (Pantocsek) Cleve-Euler 1951 |
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| Cyclotella comta var. genuina Cleve-Euler 1951 |
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| Cyclotella comta f. pentanotata Cleve-Euler 1951 |
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| Cyclotella comta f. quadrijuncta (Schröter) Cleve-Euler 1951 |
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| Cyclotella comta f. spectabilis Cleve-Euler Cleve-Euler 1951 |
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| Cyclotella frigida Cleve-Euler 1951 |
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| Cyclotella glomerata f. lucernensis (Bachmann) Cleve-Euler 1951 |
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| Cyclotella gothica Cleve-Euler 1951 |
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| Cyclotella kuetzingiana f. abnormis Cleve-Euler 1951 |
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| Cyclotella kuetzingiana var. genuina Cleve-Euler 1951 |
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| Cyclotella kuetzingiana f. glabra Cleve-Euler 1951 |
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| Cyclotella kuetzingiana f. laevis Cleve-Euler 1951 |
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| Cyclotella kuetzingiana f. major (Grunow in Van Heurck) Cleve-Euler 1951 |
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