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| Nitzschia sinuata var. tumida (Hantzsch in Rabenhorst; Rabenhorst) Cleve-Euler 1952 |
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| Nitzschia sigma f. major (Hustedt in Schmidt et al.) Cleve-Euler 1952 |
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| Surirella robusta var. astridae (Hustedt in Schmidt et al.) Cleve-Euler 1952 |
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| Nitzschia commutata var. pamirensis (Hustedt) Cleve-Euler 1952 |
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| Surirella ovata f. constricta (Hustedt) Cleve-Euler 1952 |
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| Surirella tenera f. subconstricta (Hustedt) Cleve-Euler 1952 |
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| Frustulia saxonica var. undulata (Hustedt; Hustedt in Schmidt et al.) Cleve-Euler 1952 |
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| Nitzschia baltica (J. Dannfelt) Cleve-Euler 1952 |
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| Nitzschia filiformis var. ignorata (Krasske) Cleve-Euler 1952 |
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| Rhopalodia gibberula var. musculus (Kützing) Cleve-Euler 1952 |
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| Surirella ovata var. angusta (Kützing) Cleve-Euler 1952 |
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| Nitzschia panduriformis var. elegans (Lagerstedt) Cleve-Euler 1952 |
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| Epithemia zebra f. longissima (M. Peragallo & Heribaud in Heribaud) Cleve-Euler 1952 |
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| Rhopalodia gibba f. longissima (M. Peragallo & Héribaud in Héribaud) Cleve-Euler 1952 |
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| Navicula cuspidata f. heribaudi (M. Peragallo in Héribaud) Cleve-Euler 1952 |
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| Navicula cuspidata f. heribaudi (M. Peragallo in Heribaud) Cleve-Euler 1952 |
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| Surirella subsala var. tenuis (Mayer) Cleve-Euler 1952 |
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| Cymatopleura elliptica var. turicensis (Meister) Cleve-Euler 1952 |
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| Surirella biseriata f. punctata (Meister) Cleve-Euler 1952 |
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| Surirella helvetica var. tibetica (Mereschkowsky) Cleve-Euler 1952 |
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