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| Caloneis bacillum var. fasciata (Cleve) Mayer 1939 |
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| Caloneis bacillum f. fasciata (Cleve) Mayer 1939 |
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| Caloneis bacillum f. fonticola (Grunow) Mayer 1939 |
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| Caloneis diversistriata Mayer 1939 |
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| Caloneis silicula var. gibba Mayer 1939 |
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| Cymbella cuspidata var. lanceolata Mayer 1939 |
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| Cymbella cuspidata var. rostrata (Rabenhorst) Mayer 1939 |
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| Cymbella heteropleura var. minor Mayer 1939 |
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| Encyonema ventricosum f. lunula (Hilse) Mayer 1939 |
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| Gomphonema angustatum f. productum (Grunow) Mayer 1939 |
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| Gomphonema angustatum f. productum (Grunow) Mayer 1939 |
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| Melosira italica var. muzzanensis (Meister) Mayer 1939 |
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| Meridion circulare var. ("lusus") zinckeni (Kützing) Mayer 1939 |
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| Navicula bacilliformis var. nuda Mayer 1939 |
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| Neidium affine (affinis) f. subrostrata Mayer 1939 |
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| Pinnularia brevicostata var. leptostauron sensu Mayer 1939 |
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| Pinnularia flexuosa X viridis Mayer 1939 |
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| Pinnularia hemileptogongyla Mayer 1939 |
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| Pinnularia hemistreptoraphe Mayer 1939 |
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| Pinnularia leptogongyla sensu Mayer 1939 |
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