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| Eunotia arcus f. bidens (Grunow in Van Heurck) Hustedt 1957 |
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| Fragilaria capucina f. lanceolata (Grunow in Van Heurck) Hustedt 1957 |
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| Nitzschia thermalis f. intermedia (Grunow in Van Heurck) Hustedt 1957 |
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| Synedra parasitica f. subconstricta (Grunow in Van Heurck) Hustedt 1957 |
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| Synedra pulchella f. naviculacea (Grunow in Van Heurck) Hustedt 1957 |
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| Surirella linearis f. constricta (Grunow) Hustedt 1957 |
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| Cymatopleura elliptica f. nobilis (Hantzsch) Hustedt 1957 |
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| Stauroneis alabamae f. angulata (Heiden in Schmidt et al.) Hustedt 1957 |
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| Synedra pulchella f. lacerata (Hustedt in Schmidt et al.) Hustedt 1957 |
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| Synedra ulna f. impressa (Hustedt in Schmidt et al.) Hustedt 1957 |
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| Fragilaria construens f. subsalina (Hustedt) Hustedt 1957 |
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| Navicula pupula f. capitata (Hustedt) Hustedt 1957 |
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| Navicula pupula f. rostrata (Hustedt) Hustedt 1957 |
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| Pinnularia gibba f. linearis (Hustedt) Hustedt 1957 |
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| Surirella splendida f. punctata (Hustedt) Hustedt 1957 |
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| Actinocyclus normanii f. subsalsa (Juhlin-Dannfelt) Hustedt 1957 |
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| Frustulia creuzburgensis (Krasske) Hustedt 1957 |
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| Epithemia zebra f. porcellus (Kützing) Hustedt 1957 |
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| Epithemia zebra f. saxonica (Kützing) Hustedt 1957 |
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| Fragilaria familaris (Kützing) Hustedt 1957 |
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