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| Achnanthes lanceolata f. pura Mayer 1917 |
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| Achnanthes lanceolata f. semipura Mayer 1917 |
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| Achnanthes lanceolata f. typica Mayer 1917 |
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| Caloneis fasciata var. undulata Mayer 1917 |
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| Caloneis silicula var. gibba Mayer 1917 |
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| Caloneis silicula var. subgibba Mayer 1917 |
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| Caloneis silicula var. subundulata (Grunow in Cleve & Grunow) Mayer 1917 |
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| Caloneis silicula var. subundulata (Grunow in Cleve & Grunow) Mayer 1917 |
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| Cymbella bipartita Mayer 1917 |
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| Cymbella ventricosa var. laevis (Naegeli in Rabenhorst) Mayer 1917 |
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| Epithemia zebra var. tenuirostris Mayer 1917 |
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| Eunotia formica var. subparallela Mayer 1917 |
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| Eunotia major (maius) (maior) f. curta Mayer 1917 |
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| Eunotia nymanniana var. inflata Mayer 1917 |
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| Eunotia paludosa f. incisa Mayer 1917 |
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| Eunotia paludosa var. lunata Mayer 1917 |
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| Eunotia pectinalis f. biconstricta (Grunow in Van Heurck) Mayer 1917 |
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| Eunotia pectinalis var. bidens Mayer 1917 |
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| Eunotia pectinalis var. cymbelloides Mayer 1917 |
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| Eunotia pectinalis f. triundulata (Grunow in Rabenhorst; Rabenhorst) Mayer 1917 |
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| Eunotia pectinalis f. undulata Mayer 1917 |
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| Eunotia pectinalis f. ventricosa (Grunow in Van Heurck) Mayer 1917 |
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| Eunotia praerupta f. curta (Grunow in Van Heurck) Mayer 1917 |
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| Eunotia praerupta var. platycephala Mayer 1917 |
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| Eunotia tridentula f. quadridentata Mayer 1917 |
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| Eunotia tridentula var. quadridentata Mayer 1917 |
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| Fragilaria acuta sensu Mayer 1917 |
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| Fragilaria bicapitata Mayer 1917 |
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| Fragilaria bicapitata var. curta Mayer 1917 |
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| Fragilaria bicapitata var. genuina Mayer 1917 |
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| Fragilaria brevistriata var. acuta Mayer 1917 |
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| Fragilaria brevistriata var. undulata Mayer 1917 |
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| Fragilaria construens f. rhomboidalis (Mayer) Mayer 1917 |
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| Fragilaria construens var. rhomboidalis Mayer 1917 |
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| Fragilaria construens f. subrotunda Mayer 1917 |
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| Fragilaria harrisonii var. woerthensis Mayer 1917 |
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| Fragilaria virescens var. acuminata Mayer 1917 |
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| Fragilaria virescens var. birostrata Mayer 1917 |
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| Fragilaria virescens var. constricta Mayer 1917 |
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| Frustulia saxonica var. capitata Mayer 1917 |
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| Gomphonema acuminatum f. curta Mayer 1917 |
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| Gomphonema montanum f. curta Mayer 1917 |
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| Gomphonema pinnularoides Mayer 1917 |
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| Meridion circulare var. incostata Mayer 1917 |
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| Meridion circulare var. zinkenii (Kutzing; Kutzing) Mayer 1917 |
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| Navicula falaisensis (falaisiensis) var. angusta (Grunow) Mayer 1917 |
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| Navicula minuta Mayer 1917 |
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| Navicula minuta var. asymmetrica Mayer 1917 |
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| Navicula minuta var. hyalina Mayer 1917 |
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| Navicula minuta var. vera Mayer 1917 |
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| Navicula parva var. cruciata Mayer 1917 |
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| Navicula parva var. normalis Mayer 1917 |
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| Navicula parva var. recta Mayer 1917 |
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| Navicula subparallela Mayer 1917 |
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| Navicula subparallela var. semicrucigera Mayer 1917 |
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| Navicula subparallela var. typica Mayer 1917 |
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| Navicula viridula var. avenaceoides Mayer 1917 |
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| Neidium affine (affinis) f. pusilla Mayer 1917 |
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| Neidium affine (affinis) f. pygmaea Mayer 1917 |
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| Neidium bisulcatum var. inflata Mayer 1917 |
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| Neidium hercynicum Mayer 1917 |
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| Neidium iridis var. amphirhynchus Mayer 1917 |
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| Pinnularia bavarica f. continua Mayer 1917 |
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| Pinnularia bavarica f. genuina Mayer 1917 |
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| Pinnularia brevicostata f. semicruciata Mayer 1917 |
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| Pinnularia dactylus var. orbigera Mayer 1917 |
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| Pinnularia divergens var. lanceolata Mayer 1917 |
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| Pinnularia divergens var. sublinearis Mayer 1917 |
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| Pinnularia inconstans Mayer 1917 |
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| Pinnularia inconstans var. constricta Mayer 1917 |
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| Pinnularia inconstans f. curta Mayer 1917 |
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| Pinnularia inconstans var. genuina Mayer 1917 |
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| Pinnularia inconstans var. semicontinua Mayer 1917 |
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| Pinnularia lata var. curtestriata Mayer 1917 |
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| Pinnularia lata var. genuina Mayer 1917 |
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| Pinnularia lata var. thuringiaca (Rabenhorst; Rabenhorst) Mayer 1917 |
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| Pinnularia legumen f. elliptica Mayer 1917 |
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| Pinnularia legumen var. elliptica Mayer 1917 |
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| Pinnularia major (maior) var. elliptica Mayer 1917 |
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| Pinnularia molaris var. semicruciata Mayer 1917 |
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| Pinnularia nodosa var. constricta Mayer 1917 |
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| Pinnularia parva (parvula) var. continua Mayer 1917 |
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| Pinnularia parva (parvula) var. curta Mayer 1917 |
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| Pinnularia parva (parvula) var. genuina Mayer 1917 |
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| Pinnularia parva (parvula) var. semicruciata Mayer 1917 |
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| Pinnularia pseudogracillima (Mayer) Mayer 1917 |
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| Pinnularia pseudogracillima var. genuina Mayer 1917 |
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| Pinnularia pseudogracillima f. interrupta (Mayer) Mayer 1917 |
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| Pinnularia pseudogracillima var. minor (Mayer) Mayer 1917 |
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| Pinnularia pseudogracillima f. semicruciata (Mayer) Mayer 1917 |
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| Pinnularia stauroptera f. asymmetrica Mayer 1917 |
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| Pinnularia stauroptera f. clevei (Meister) Mayer 1917 |
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| Pinnularia stauroptera f. cruciata Mayer 1917 |
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| Pinnularia stauroptera var. genuina Mayer 1917 |
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| Pinnularia stauroptera f. hyalina Mayer 1917 |
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| Pinnularia stauroptera f. interrupta (Cleve) Mayer 1917 |
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| Pinnularia stauroptera var. minuta Mayer 1917 |
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| Pinnularia stauroptera f. normalis Mayer 1917 |
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| Pinnularia stauroptera f. recta Mayer 1917 |
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| Pinnularia stauroptera f. semicruciata (Cleve) Mayer 1917 |
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| Pinnularia stauroptera f. semicrucigera Mayer 1917 |
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| Pinnularia stauroptera var. subparallela Mayer 1917 |
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| Pinnularia stauroptera f. typica Mayer 1917 |
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| Pinnularia stauroptera f. vera Mayer 1917 |
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| Pinnularia subcapitata var. hilseana Mayer 1917 |
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| Pinnularia viridis var. crucigera Mayer 1917 |
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| Surirella tenera f. constricta Mayer 1917 |
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| Surirella tenuis Mayer 1917 |
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| Surirella (Suriraya) apiculata f. lata Mayer 1917 |
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| Surirella (Suriraya) apiculata var. lata Mayer 1917 |
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| Surirella (Suriraya) biseriata f. constricta (Hustedt; Grunow ex Hustedt in Schmidt et al.) Mayer 1917 |
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| Surirella (Suriraya) biseriata f. genuina Mayer 1917 |
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| Surirella (Suriraya) biseriata var. maxima Grunow ex Mayer 1917 |
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| Surirella (Suriraya) biseriata f. obtusa (Maly) Mayer 1917 |
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| Surirella (Suriraya) biseriata f. subacuminata Mayer 1917 |
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| Surirella (Suriraya) biseriata f. subtruncata (Lemmermann) Mayer 1917 |
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| Surirella (Suriraya) biseriata f. typica Mayer 1917 |
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| Surirella (Suriraya) biseriata f. typica Mayer 1917 |
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| Surirella (Suriraya) biseriata f. typica Mayer 1917 |
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| Synedra rumpens f. curta Mayer 1917 |
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| Synedra scotica Mayer 1917 |
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| Synedra scotica var. campyla Mayer 1917 |
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| Synedra scotica var. genuina Mayer 1917 |
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| Synedra scotica var. undulata Mayer 1917 |
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| Synedra scotica var. undulata lusus campyla (Hilse ex Rabenhorst) Mayer 1917 |
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