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| Surirella splendida var. saxonica (Auerswald ex Rabenhorst) Mayer 1913 |
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| Nitzschia communis var. minuta (Bleisch) Mayer 1913 |
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| Neidium affine (affinis) var. maxima (maximum) (Cleve) Mayer 1913 |
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| Neidium iridis var. maxima (maximum) (Cleve) Mayer 1913 |
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| Pinnularia nodosa var. genuina (Cleve) Mayer 1913 |
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| Gomphonema acuminatum var. intermedia (Dippel) Mayer 1913 |
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| Navicula cuspidata var. subrostrata (Dippel) Mayer 1913 |
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| Pinnularia nobilis var. intermedia (Dippel) Mayer 1913 |
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| Surirella splendida var. minor (Dippel) Mayer 1913 |
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| Caloneis silicula subsp. ventricosa (Ehrenberg) Mayer 1913 |
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| Gomphonema constrictum f. turgidum (Ehrenberg) Mayer 1913 |
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| Pinnularia major (maior) var. leptogongyla (Ehrenberg) Mayer 1913 |
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| Gomphonema acuminatum f. laticeps (Ehrenberg; Grunow in Van Heurck) Mayer 1913 |
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| Pinnularia protracta (Grunow in Cleve & Grunow) Mayer 1913 |
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| Eunotia diodon f. diminuta (Grunow in Van Heurck) Mayer 1913 |
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| Gomphonema intricatum f. subventricosa (Grunow in Van Heurck) Mayer 1913 |
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| Navicula dicephala var. minor (Grunow in Van Heurck) Mayer 1913 |
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| Navicula peregrina var. upsaliensis (Grunow in Van Heurck) Mayer 1913 |
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| Nitzschia amphioxys f. major (Grunow in Van Heurck) Mayer 1913 |
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| Pinnularia microstauron var. diminuta (Grunow in Van Heurck) Mayer 1913 |
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