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| Achnanthes lanceolata var. ventricosa Hustedt 1914 |
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| Caloneis silicula var. tenuis Hustedt 1914 |
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| Eunotia robusta f. abrupta Hustedt 1914 |
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| Fragilaria virescens var. elliptica Hustedt 1914 |
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| Navicula bacilliformis var. cruciata Hustedt 1914 |
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| Navicula minima f. magis stauroneiformis (Grunow in Van Heurck) Hustedt 1914 |
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| Neidium affine (affinis) f. undulata Hustedt 1914 |
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| Neidium amphirhynchus var. constrictum Hustedt 1914 |
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| Neidium iridis f. maxima (Cleve) Hustedt 1914 |
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| Neidium productum var. constrictum Hustedt 1914 |
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| Pinnularia appendiculata var. naveana (Grunow) Hustedt 1914 |
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| Pinnularia appendiculata var. silesiaca Hustedt 1914 |
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| Pinnularia borealis var. brevicostata Hustedt 1914 |
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| Pinnularia divergens var. undulata (M. Peragallo & Heribaud in Heribaud) Hustedt 1914 |
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| Pinnularia karelica var. stauroneiformis Hustedt 1914 |
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| Pinnularia major (maior) var. hyalina Hustedt 1914 |
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| Pinnularia stauroptera var. mesogongyla (Ehrenberg) Hustedt 1914 |
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| Pinnularia viridis var. interrupta Hustedt 1914 |
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| Surirella (Suriraya) apiculata var. constricta Hustedt 1914 |
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