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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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| Caloneis alpestris var. genuina Mayer 1919 |
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| Caloneis alpestris var. lanceolata Mayer 1919 |
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| Ceratoneis arcus var. incisa Mayer 1919 |
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| Ceratoneis arcus f. undulata Mayer 1919 |
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| Cocconeis flexella var. appendiculata Mayer 1919 |
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| Cocconeis thumensis Mayer 1919 |
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| Cyclotella comta f. evidenterpunctata Mayer 1919 |
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| Cyclotella melosiroides var. clavigera Mayer 1919 |
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| Cymbella aequalis var. genuina Mayer 1919 |
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| Cymbella aequalis var. platycephala Mayer 1919 |
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| Cymbella amphicephala var. genuina Mayer 1919 |
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| Cymbella angustata var. capitata Mayer 1919 |
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| Cymbella delicatula var. capitata Mayer 1919 |
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| Cymbella leptoceros f. genuina Mayer 1919 |
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| Cymbella leptoceros f. minor Mayer 1919 |
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| Cymbella microcephala var. rostellata Mayer 1919 |
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| Cymbella rupicola var. genuina Mayer 1919 |
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| Cymbella rupicola var. rostrata Mayer 1919 |
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| Denticula tenuis var. genuina Mayer 1919 |
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| Diatoma tenue var. inflata Mayer 1919 |
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| Diatoma vulgare f. tenuicollis Mayer 1919 |
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| Diploneis didyma f. linearis Mayer 1919 |
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| Diploneis didyma f. linearis Mayer 1919 |
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| Diploneis didyma f. subinflata Mayer 1919 |
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| Diploneis didyma f. typica Mayer 1919 |
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| Fragilaria brevistriata var. linearis Mayer 1919 |
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| Fragilaria construens f. undulata Mayer 1919 |
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| Fragilaria gracillima Mayer 1919 |
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| Fragilaria pinnata var. inflata Mayer 1919 |
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| Fragilaria pinnata var. parallela Mayer 1919 |
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| Gomphonema angustatum f. breve Mayer 1919 |
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| Gomphonema angustatum f. breve Mayer 1919 |
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| Gomphonema insigne f. lusus cymbelliforme Mayer 1919 |
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| Gomphonema insigne var. undulatum Mayer 1919 |
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| Gomphonema intricatum var. pusillum Mayer 1919 |
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| Gomphonema intricatum var. semiaperta Mayer 1919 |
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| Gomphonema olivaceum f. dubia Mayer 1919 |
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| Gomphonema olivaceum f. minores Mayer 1919 |
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| Gomphonema parvulum var. genuinum (genuina) Mayer 1919 |
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| Gomphonema subclavatum var. genuinum Mayer 1919 |
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| Gomphonema subclavatum var. medium Mayer 1919 |
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| Gomphonema subclavatum var. tenellum Mayer 1919 |
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| Navicula bacilliformis var. genuina Mayer 1919 |
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| Navicula bacilliformis var. neglecta Mayer 1919 |
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| Navicula cincta var. genuina Mayer 1919 |
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| Navicula dicephala var. genuina Mayer 1919 |
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| Navicula dimidiata Mayer 1919 |
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| Navicula graciloides Mayer 1919 |
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| Navicula gregaria var. rostellata Mayer 1919 |
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| Navicula involuta Mayer 1919 |
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| Navicula laeta Mayer 1919 |
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| Navicula peregrina f. acuta Mayer 1919 |
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| Navicula placentula var. genuina Mayer 1919 |
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| Navicula tuscula var. genuina Mayer 1919 |
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| Neidium dubium f. genuinum Mayer 1919 |
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| Neidium dubium var. genuinum Mayer 1919 |
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| Neidium tenellum Mayer 1919 |
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| Nitzschia amphibia var. genuina Mayer 1919 |
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| Nitzschia amphibia var. intermedia Mayer 1919 |
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| Nitzschia microcephala var. impressa Mayer 1919 |
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| Surirella gracillima Mayer 1919 |
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| Surirella thumensis Mayer 1919 |
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| Synedra delicatula Mayer 1919 |
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| Synedra vaucheriae f. brevis Mayer 1919 |
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| Synedra vaucheriae f. lanceolata Mayer 1919 |
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| Synedra vaucheriae var. rhomboidalis Mayer 1919 |
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| Synedra vaucheriae var. rhomboidalis Mayer 1919 |
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| Synedra vaucheriae f. typica Mayer 1919 |
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| Synedra vaucheriae var. undulata Mayer 1919 |
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| Caloneis alpestris sensu Mayer 1919 |
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| Hantzschia amphioxys var. elongata sensu Mayer 1919 |
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| Navicula cincta var. angusta sensu Mayer 1919 |
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| Navicula pusio sensu Mayer 1919 |
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| Navicula tuscula var. rostrata sensu Mayer 1919 |
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