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| Cyclotella castracanei Eulenstein ex Fricke in Schmidt et al. 1901 |
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| Stephanodiscus astraea var. intermedia Fricke in Schmidt et al. 1901 |
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| Stephanodiscus astraea var. multipunctata Fricke in Schmidt et al. 1901 |
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| Stephanodiscus astraea var. transilvanica (Pantocsek) Fricke in Schmidt et al. 1901 |
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| Stephanodiscus carconensis f. maxima Fricke in Schmidt et al. 1901 |
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| Stephanodiscus carconensis f. minor Grunow in Fricke in A. Schmidt 1901 |
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| Stephanodiscus niagarae var. magnifica Fricke in Schmidt et al. 1901 |
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| Stephanodiscus niagarae f. minor Fricke in Schmidt et al. 1901 |
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