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| Cymbella leptoceras f. curta "Grunow" Mayer 1919 |
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| Synedra ulna f. bicurvata (Biene ex Rabenhorst) Mayer 1919 |
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| Cyclotella comta var. ovalis (Fricke) Mayer 1919 |
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| Fragilaria pinnata var. intermedia (Grunow in litt., Grunow) Mayer 1919 |
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| Cymbella aequalis var. subaequalis (Grunow in Van Heurck) Mayer 1919 |
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| Gomphonema subclavatum var. commutatum (Grunow in Van Heurck) Mayer 1919 |
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| Neidium dubium var. peisonis (Grunow) Mayer 1919 |
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| Nitzschia amphioxys var. amphilepta (Grunow) Mayer 1919 |
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| Surirella ovalis f. ovata (Kützing) Mayer 1919 |
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| Fragilaria construens f. subrotunda (Mayer) Mayer 1919 |
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| Fragilaria construens var. subrotunda (Mayer) Mayer 1919 |
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| Gomphonema olivaceum var. inflata (Mayer) Mayer 1919 |
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| Gomphonema olivaceum f. minutulum (minutula) (Mayer) Mayer 1919 |
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| Achnanthidium lanceolatum var. rostellatum ‘Hustedt’ according to Mayer 1919 |
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| Achnanthes conspicua Mayer 1919 |
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| Achnanthidium lanceolatum var. rhomboidale Mayer 1919 |
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| Amphora coffeaeformis var. thumensis Mayer 1919 |
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| Anomoeoneis exilis var. genuina Mayer 1919 |
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| Anomoeoneis exilis var. lanceolata Mayer 1919 |
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| Anomoeoneis exilis f. subacuminata Mayer 1919 |
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