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| Achnanthes lanceolata f. rostrata (Østrup) Hustedt 1957 |
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| Actinocyclus normanii (Gregory ex Greville) Hustedt 1957 |
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| Actinocyclus normanii f. subsalsa (Juhlin-Dannfelt) Hustedt 1957 |
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| Caloneis amphisbaena f. subsalina (Donkin) Hustedt 1957 |
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| Caloneis bacillum f. lancettula (Schulz) Hustedt 1957 |
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| Cocconeis placentula f. euglypta (Ehrenberg) Hustedt 1957 |
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| Cocconeis placentula f. lineata (Ehrenberg) Hustedt 1957 |
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| Cyclotella nana Hustedt 1957 |
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| Cymatopleura elliptica f. nobilis (Hantzsch) Hustedt 1957 |
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| Cymatopleura solea f. regula (Ehrenberg) Hustedt 1957 |
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| Diatoma vulgare f. linearis (Grunow in Van Heurck) Hustedt 1957 |
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| Epithemia turgida f. granulata (Ehrenberg) 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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| Eunotia arcus f. bidens (Grunow in Van Heurck) Hustedt 1957 |
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| Eunotia lunaris f. subarcuata (Naegeli in Kutzing) Hustedt 1957 |
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| Eunotia pectinalis f. undulata (Ralfs) Hustedt 1957 |
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| Eunotia pectinalis f. ventralis (Ehrenberg; Ehrenberg) Hustedt 1957 |
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| Fragilaria capucina f. lanceolata (Grunow in Van Heurck) Hustedt 1957 |
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| Fragilaria capucina f. mesolepta (Rabenhorst) Hustedt 1957 |
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