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| Fragilaria intermedia var. continua Cleve-Euler 1932 |
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| Fragilaria intermedia f. deformis Cleve-Euler 1932 |
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| Fragilaria intermedia var. distans (Grunow in Van Heurck) Cleve-Euler 1932 |
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| Fragilaria intermedia f. minor (Grunow in Van Heurck) Cleve-Euler 1932 |
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| Fragilaria intermedia f. minor (Grunow in Van Heurck) Cleve-Euler 1932 |
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| Fragilaria intermedia var. semisinuata Cleve-Euler 1932 |
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| Fragilaria mutabilis var. intercedens (Heribaud) Cleve-Euler 1932 |
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| Fragilaria mutabilis f. martyi (Heribaud) Cleve-Euler 1932 |
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| Fragilaria mutabilis var. turgidula (Schumann) Cleve-Euler 1932 |
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| Fragilaria rumpens var. familiaris (Kützing) Cleve-Euler 1932 |
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| Gomphonema acuminatum f. curta Cleve-Euler 1932 |
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| Gomphonema acuminatum var. directa (directum) Cleve-Euler 1932 |
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| Gomphonema acuminatum var. pantocsekii Cleve-Euler 1932 |
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| Gomphonema constrictum var. turgida (Ehrenberg) Cleve-Euler 1932 |
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| Gomphonema elongatum var. tenuis Cleve-Euler 1932 |
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| Gomphonema intricatum f. densestriata Cleve-Euler 1932 |
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| Gomphonema intricatum f. heteromorpha Cleve-Euler 1932 |
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| Gomphonema intricatum f. laticeps Cleve-Euler 1932 |
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| Gomphonema intricatum var. pumila Cleve-Euler 1932 |
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| Gomphonema lanceolatum var. affine (Kützing) Cleve-Euler 1932 |
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