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| Pinnularia stauroptera f. interrupta (Cleve) Mayer 1917 |
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| Pinnularia stauroptera f. semicruciata (Cleve) Mayer 1917 |
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| Caloneis silicula var. subundulata (Grunow in Cleve & Grunow) Mayer 1917 |
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| Caloneis silicula var. subundulata (Grunow in Cleve & Grunow) Mayer 1917 |
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| Eunotia pectinalis f. triundulata (Grunow in Rabenhorst; Rabenhorst) Mayer 1917 |
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| Eunotia pectinalis f. biconstricta (Grunow in Van Heurck) Mayer 1917 |
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| Eunotia pectinalis f. ventricosa (Grunow in Van Heurck) Mayer 1917 |
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| Eunotia praerupta f. curta (Grunow in Van Heurck) Mayer 1917 |
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| Navicula falaisensis (falaisiensis) var. angusta (Grunow) Mayer 1917 |
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| Synedra scotica var. undulata lusus campyla (Hilse ex Rabenhorst) Mayer 1917 |
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| Surirella (Suriraya) biseriata f. constricta (Hustedt; Grunow ex Hustedt in Schmidt et al.) Mayer 1917 |
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| Meridion circulare var. zinkenii (Kutzing; Kutzing) Mayer 1917 |
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| Surirella (Suriraya) biseriata f. subtruncata (Lemmermann) Mayer 1917 |
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| Surirella (Suriraya) biseriata f. obtusa (Maly) Mayer 1917 |
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| Fragilaria construens f. rhomboidalis (Mayer) Mayer 1917 |
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| Pinnularia pseudogracillima (Mayer) Mayer 1917 |
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| Pinnularia pseudogracillima f. interrupta (Mayer) Mayer 1917 |
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| Pinnularia pseudogracillima var. minor (Mayer) Mayer 1917 |
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| Pinnularia pseudogracillima f. semicruciata (Mayer) Mayer 1917 |
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| Pinnularia stauroptera f. clevei (Meister) Mayer 1917 |
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