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| Achnanthidium lanceolatum var. conspicuum Mayer 1912 |
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| Fragilaria parasitica var. constricta Mayer 1912 |
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| Fragilaria parasitica var. genuina Mayer 1912 |
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| Fragilaria parasitica var. rhomboidalis Mayer 1912 |
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| Meridion circulare f. curvata (subf. curvata) Mayer 1912 |
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| Meridion circulare var. gracilis Mayer 1912 |
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| Navicula peregrina var. menisculus (Schumann) A. Mayer 1912 |
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| Navicula viridula var. capitata A. Mayer 1912 |
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| Navicula viridula var. capitata Mayer 1912 |
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| Navicula viridula var. genuina Mayer 1912 |
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| Pinnularia major Mayer 1912 |
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| Pinnularia major f. semicruciata A. Mayer 1912 |
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| Pinnularia microstauron f. genuina A. Mayer 1912 |
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| Pinnularia viridis f. cruciata A. Mayer 1912 |
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| Surirella ovalis var. suevica Mayer 1912 |
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| Surirella splendida var. angusta Mayer 1912 |
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| Surirella splendida var. elongata Mayer 1912 |
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| Surirella splendida var. genuina Mayer 1912 |
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| Surirella (Suriraya) apiculata sensu Mayer 1912 |
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| Surirella (Suriraya) apiculata f. pygmaea Mayer 1912 |
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