Achnanthes lanceolata f. pura Mayer, 1916 (original description)
Achnanthes lanceolata f. semipura Mayer, 1916 (original description)
Achnanthes lanceolata f. typica Mayer, 1916 (original description)
Caloneis silicula var. gibba Mayer, 1917 (original description)
Caloneis silicula var. subgibba Mayer, 1917 (original description)
Caloneis silicula var. subundulata (Grunow) Mayer, 1917 accepted as Navicula ventricosa var. subundulata Grunow, 1880 (new combination reference)
Cymbella bipartita A.Mayer, 1916 (original description)
Cymbella ventricosa var. laevis (Nägeli) Mayer, 1917 accepted as Cymbella laevis Nägeli, 1863 (new combination reference)
Epithemia zebra var. tenuirostris Mayer, 1916 (1917) (original description)
Eunotia formica var. subparallela Mayer, 1916 (1917) (original description)
Eunotia major f. curta Mayer, 1916 (1917) (original description)
Eunotia nymanniana var. inflata Mayer, 1916 (1917) (original description)
Eunotia paludosa f. incisa Mayer, 1917 (original description)
Eunotia paludosa var. lunata Mayer, 1917 (original description)
Eunotia pectinalis f. biconstricta (Grunow in Van Heurck) Mayer, 1916 accepted as Eunotia pectinalis f. biconstricta Grunow in Van Heurck, 1881 (new combination reference)
Eunotia pectinalis f. triundulata (Grunow in Rabenhorst; Rabenhorst) Mayer, 1916 (1917) accepted as Eunotia pectinalis var. triundulata Grunow, 1865 (new combination reference)
Eunotia pectinalis f. undulata Mayer, 1916 (1917) (original description)
Eunotia pectinalis f. ventricosa (Grunow in Van Heurck) Mayer, 1916 (1917) (new combination reference)
Eunotia pectinalis var. bidens Mayer, 1916 (1917) (original description)
Eunotia pectinalis var. cymbelloides Mayer, 1916 (1917) (original description)
Eunotia praerupta f. curta (Grunow) Mayer, 1917 (new combination reference)
Eunotia praerupta var. platycephala Mayer, 1916 (original description)
Eunotia tridentula f. quadridentata Mayer, 1916 (1917) (original description)
Eunotia tridentula var. quadridentata Mayer, 1917 (original description)
Fragilaria acuta sensu Mayer, 1916 (original description)
Fragilaria bicapitata f. bicapitata Mayer, 1916 (1917) (original description)
Fragilaria brevistriata var. acuta Mayer, 1916 (1917) (original description)
Fragilaria brevistriata var. undulata Mayer, 1916 (1917) (original description)
Fragilaria construens f. rhomboidalis (Mayer) Mayer, 1916 (1917) accepted as Fragilaria construens var. rhomboidalis Mayer, 1916 (1917) (new combination reference)
Fragilaria construens f. subrotunda Mayer, 1917 (original description)
Fragilaria construens var. rhomboidalis Mayer, 1916 (1917) (original description)
Fragilaria virescens f. birostrata Mayer, 1916 (original description)
Fragilaria virescens var. acuminata Mayer, 1916 (1917) (original description)
Fragilaria virescens var. constricta Mayer, 1916 (1917) (original description)
Frustulia saxonica var. capitata A.Mayer, 1917 (original description)
Gomphonema acuminatum f. curta Mayer, 1916 (1917) (original description)
Gomphonema montanum f. curta Mayer, 1917 (original description)
Gomphonema pinnularoides Mayer, 1917 (original description)
Meridion circulare var. incostata Mayer, 1916 (1917) (original description)
Meridion circulare var. zinkenii (Kutzing; Kutzing) Mayer, 1916 (1917) (new combination reference)
Navicula falaisensis var. angusta (Grunow) Mayer, 1917 accepted as Navicula angusta Grunow, 1860 (new combination reference)
Navicula minuta var. asymmetrica Mayer, 1916 (1917) (original description)
Navicula minuta var. hyalina Mayer, 1916 (1917) (original description)
Navicula minuta var. minuta Mayer, 1916 (1917) (original description)
Navicula minuta var. vera Mayer, 1916 (original description)
Navicula parva var. cruciata Mayer, 1916 (1917) (original description)
Navicula parva var. normalis Mayer, 1916 (1917) (original description)
Navicula parva var. recta Mayer, 1916 (1917) (original description)
Navicula subparallela var. semicrucigera Mayer, 1916 (1917) (original description)
Navicula subparallela var. subparallela Mayer, 1917 (original description)
Navicula subparallela var. typica Mayer, 1916 (1917) (original description)
Navicula viridula var. avenaceoides Mayer, 1917 (original description)
Neidium affine f. pusilla Mayer, 1916 (1917) (original description)
Neidium affine f. pygmaea Mayer, 1916 (1917) (original description)
Neidium bisulcatum var. inflata Mayer, 1916 (1917) (original description)
Neidium hercynicum f. hercynicum Mayer, 1916 (1917) (original description)
Neidium iridis var. amphirhynchus Mayer, 1917 (original description)
Pinnularia brevicostata f. semicruciata Mayer, 1916 (1917) (original description)
Pinnularia dactylus var. orbigera Mayer, 1916 (1917) (original description)
Pinnularia divergens var. lanceolata Mayer, 1916 (1917) (original description)
Pinnularia divergens var. sublinearis Mayer, 1916 (1917) (original description)
Pinnularia inconstans f. curta Mayer, 1916 (1917) (original description)
Pinnularia inconstans f. inconstans Mayer, 1916 (1917) (original description)
Pinnularia inconstans var. constricta Mayer, 1916 (1917) (original description)
Pinnularia inconstans var. genuina Mayer, 1916 (1917) (original description)
Pinnularia inconstans var. semicontinua Mayer, 1916 (1917) (original description)
Pinnularia lata f. thuringiaca (Rabenhorst) Mayer accepted as Navicula thuringiaca var. thuringiaca Rabenhorst, 1848-1860 (new combination reference)
Pinnularia lata var. curtestriata Mayer, 1916 (1917) (original description)
Pinnularia lata var. genuina Mayer, 1916 (1917) (original description)
Pinnularia legumen f. elliptica Mayer, 1916 (1917) (original description)
Pinnularia legumen var. elliptica Mayer, 1916 (1917) (original description)
Pinnularia major var. elliptica Mayer, 1916 (1917) (original description)
Pinnularia mesolepta f. semicruciata Mayer, 1917 (original description)
Pinnularia nodosa f. constricta Mayer, 1916 (1917) (original description)
Pinnularia parva var. continua Mayer, 1916 (1917) (original description)
Pinnularia parva var. curta Mayer, 1916 (1917) (original description)
Pinnularia parva var. genuina Mayer, 1916 (original description)
Pinnularia parva var. semicruciata Mayer, 1916 (1917) (original description)
Pinnularia stauroptera f. asymmetrica Mayer, 1916 (1917) (original description)
Pinnularia stauroptera f. clevei (Meister) Mayer, 1916 (1917) accepted as Pinnularia stauroptera f. clevei Meister, 1912 (new combination reference)
Pinnularia stauroptera f. cruciata Mayer, 1916 (1917) (original description)
Pinnularia stauroptera f. genuina Mayer, 1916 (1917) (original description)
Pinnularia stauroptera f. hyalina Mayer, 1916 (1917) (original description)
Pinnularia stauroptera f. minuta Mayer, 1916 (1917) (original description)
Pinnularia stauroptera f. normalis Mayer, 1916 (1917) (original description)
Pinnularia stauroptera f. recta Mayer, 1916 (1917) (original description)
Pinnularia stauroptera f. semicrucigera Mayer, 1916 (1917) (original description)
Pinnularia stauroptera f. subparallela Mayer, 1916 (1917) (original description)
Pinnularia stauroptera f. typica Mayer, 1916 (1917) (original description)
Pinnularia stauroptera f. vera Mayer, 1916 (1917) (original description)
Pinnularia subcapitata var. hilseana Mayer, 1917 (original description)
Pinnularia viridis var. crucigera Mayer, 1916 (1917) (original description)
Surirella apiculata f. lata Mayer, 1916 (1917) (original description)
Surirella apiculata var. lata Mayer, 1916 (1917) (original description)
Surirella biseriata f. constricta (Hustedt; Grunow ex Hustedt in Schmidt et al.) Mayer, 1916 (1917) accepted as Surirella biseriata f. constricta Hustedt, 1911 (new combination reference)
Surirella biseriata f. genuina Mayer, 1916 (1917) (original description)
Surirella biseriata f. maxima Grunow ex Mayer, 1916 (1917) (original description)
Surirella biseriata f. obtusa (Maly) Mayer, 1916 (1917) accepted as Surirella biseriata var. obtusa Maly, 1895 (new combination reference)
Surirella biseriata f. subacuminata Mayer, 1916 (1917) (original description)
Surirella biseriata f. subtruncata (Lemmermann) Mayer, 1916 (1917) (new combination reference)