Achnanthidium lanceolatum var. genuinum Mayer, 1913 (original description)
Achnanthidium lanceolatum var. inflata Mayer, 1913 (original description)
Achnanthidium lanceolatum var. minimum A.Mayer, 1913 (original description)
Amphora ovalis f. angusta Mayer (original description)
Amphora ovalis f. globosa (Schumann) Mayer accepted as Amphora globosa Schumann, 1867 (new combination reference)
Amphora ovalis f. minutissima (W.Smith) Ant.Mayer, 1913 accepted as Amphora minutissima W.Smith, 1853 (new combination reference)
Caloneis silicula f. angusta Mayer, 1913 (original description)
Caloneis silicula f. inflata (Grunow) Mayer, 1917 accepted as Navicula limosa var. inflata Grunow, 1860 (new combination reference)
Caloneis silicula f. limosa (Kützing) Mayer, 1917 accepted as Navicula limosa f. limosa Kützing, 1844 (new combination reference)
Caloneis silicula f. minima Mayer, 1913 (original description)
Caloneis silicula f. minor Mayer, 1913 (original description)
Caloneis silicula f. rhomboidalis Mayer, 1913 (original description)
Caloneis silicula var. elliptica Mayer, 1913 (original description)
Caloneis silicula var. gibberula (Kützing) Cleve, 1894 accepted as Navicula gibberula var. gibberula Kützing, 1844 (new combination reference)
Caloneis silicula var. intermedia Mayer, 1913 (original description)
Caloneis silicula var. ventricosa (Ehrenberg) (Donkin) Cleve, 1894 accepted as Navicula ventricosa var. ventricosa Ehrenberg, 1830 (new combination reference)
Ceratoneis arcus var. genuina Mayer J.Holmboe (original description)
Cocconeis pediculus f. orbicularis Mayer, 1913 (original description)
Cocconeis placentula f. minutissima Mayer, 1913 (original description)
Cocconeis placentula var. genuina Mayer, 1913 (original description)
Cymatopleura solea f. lata Mayer, 1913 (original description)
Cymatopleura solea f. minuta Mayer, 1913 (original description)
Cymbella cistula f. recta Mayer, 1913 (original description)
Cymbella cistula f. truncata Mayer, 1913 (original description)
Cymbella cistula f. typica (Meister) Mayer, 1913 accepted as Cymbella cistula var. typica Meister, 1912 (new combination reference)
Cymbella cistula f. undulata Mayer, 1913 (original description)
Cymbella cistula var. eucistula Mayer (original description)
Cymbella ehrenbergii f. ornata Mayer, 1913 (original description)
Cymbella ehrenbergii var. naviculoides Mayer, 1913 (original description)
Cymbella gastroides var. genuina Mayer, 1913 (original description)
Cymbella tumida var. genuina (Grunow) Mayer, 1913 accepted as Cocconema stomatophorum var. genuina [Grunow] in Cleve & Grunow, 1880 (new combination reference)
Cymbella ventricosa f. minuta (Hilse in Rabenhorst) Mayer, 1913 accepted as Cymbella minuta Hilse, 1862 (new combination reference)
Cymbella ventricosa var. genuina Mayer, 1913 (original description)
Diatoma anceps var. curtum Mayer, 1913 (original description)
Diatoma anceps var. longissima (Grunow) Mayer, 1913 (new combination reference)
Diploneis elliptica var. elliptica Mayer, 1913 (original description)
Diploneis ovalis f. genuina Mayer, 1913 (original description)
Diploneis ovalis f. minima Mayer, 1913 (original description)
Diploneis ovalis var. genuina Mayer, 1913 (original description)
Diploneis pygmaea Mayer, 1913 (original description)
Eunotia diodon f. diminuta (Grunow in Van Heurck) Mayer, 1913 accepted as Eunotia diodon var. diminuta Grunow, 1881 (new combination reference)
Eunotia diodon var. genuina Mayer, 1913 (original description)
Eunotia exigua var. genuina Mayer, 1918 (original description)
Eunotia exigua var. minuta (F.W.Hilse) Ant.Mayer (original description)
Eunotia lunaris var. genuina (Grunow) Mayer, 1913 accepted as Synedra lunaris var. genuina Grunow, 1862 (new combination reference)
Eunotia lunaris var. ventralis Mayer, 1913 (original description)
Eunotia major var. genuina Mayer, 1913 (original description)
Eunotia pectinalis f. genuina Mayer, 1913 (original description)
Eunotia pectinalis f. impressa (Otto Müller) Ant.Mayer, 1913 (new combination reference)
Eunotia pectinalis f. incisa (Otto Müller) Mayer, 1913 accepted as Eunotia pectinalis f. incisa Otto Müller, 1898 (new combination reference)
Eunotia pectinalis var. minus (Otto Müller) Mayer, 1913 (new combination reference)
Eunotia pectinalis var. pusilla Mayer, 1913 (original description)
Eunotia praerupta f. curta (Grunow) Mayer, 1917 (original description)
Eunotia praerupta f. subimpressa Mayer, 1913 (original description)
Fragilaria capucina var. longissima Mayer, 1913 (original description)
Fragilaria virescens f. genuina Mayer, 1913 (original description)
Gomphonema acuminatum f. laticeps (Ehrenberg) L.Dippel, 1905 accepted as Gomphonema laticeps Ehrenberg, 1843 (new combination reference)
Gomphonema acuminatum var. genuina Mayer, 1913 (original description)
Gomphonema acuminatum var. intermedia (Dippel) Mayer, 1913 (new combination reference)
Gomphonema angustatum f. genuinum Mayer, 1913 (original description)
Gomphonema augur f. genuina Mayer, 1913 (original description)
Gomphonema constrictum f. brevis Mayer, 1913 (original description)
Gomphonema constrictum f. genuina Mayer, 1913 (original description)
Gomphonema constrictum f. turgidum (Ehrenberg) Mayer, 1913 accepted as Gomphonema turgidum Ehrenberg, 1854 (new combination reference)
Gomphonema constrictum var. genuina Mayer, 1913 (original description)
Gomphonema gracile var. genuina Mayer, 1913 (original description)
Gomphonema intricatum f. subventricosa (Grunow in Van Heurck) Mayer, 1913 accepted as Gomphonema vibrio var. subventricosa H.F.Van Heurck (new combination reference)
Gomphonema intricatum var. genuina Mayer, 1913 (original description)
Gomphonema montanum f. minor Mayer, 1913 (original description)
Gomphonema montanum var. genuina Mayer, 1913 (original description)
Gomphonema olivaceum f. genuinum Mayer, 1913 (original description)
Gomphonema olivaceum f. inflata Mayer, 1913 (original description)
Melosira italica f. tenuis Mayer, 1913 (original description)
Meridion circulare f. gracilis Mayer, 1913 (original description)
Meridion circulare f. gracilis curvata Mayer, 1913 (original description)
Navicula americana f. genuina Mayer, 1913 (original description)
Navicula americana var. parallela Mayer, 1913 (original description)
Navicula cuspidata f. minor Mayer, 1913 (original description)
Navicula cuspidata var. minor Mayer, 1913 (original description)
Navicula cuspidata var. subrostrata (Dippel) Mayer, 1913 (new combination reference)
Navicula dicephala f. genuina Mayer, 1913 (original description)
Navicula dicephala f. pygmaea Mayer, 1913 (original description)
Navicula dicephala var. minor (Grunow) Mayer, 1913 (new combination reference)
Navicula gastrum f. genuina Mayer, 1913 (original description)
Navicula gracilis f. genuina Mayer, 1913 (original description)
Navicula gracilis f. minor Mayer, 1913 (original description)
Navicula hungarica f. genuina Mayer, 1913 (original description)
Navicula peregrina f. upsaliensis (Grunow) van Heurck, 1885 accepted as Navicula gastrum var. upsaliensis Grunow in Cleve & Möller, 1879 (new combination reference)
Navicula peregrina var. genuina Mayer, 1913 (original description)
Navicula peregrina var. menisculus sensu Mayer, 1913 (original description)
Navicula pseudobacillum var. pseudobacillum Mayer, 1913 (original description)
Navicula reinhardtii var. elliptica Mayer, 1913 (original description)
Navicula reinhardtii var. genuina Mayer, 1913 (original description)
Navicula reinhardtii var. ovalis Mayer, 1913 (original description)
Navicula rotaeana var. genuina Mayer, 1913 (original description)
Navicula viridula f. subparallela Mayer, 1913 (original description)
Navicula viridula var. genuina Mayer, 1911 (original description)
Neidium affine f. brevis Mayer, 1913 (original description)
Neidium affine var. elegans Mayer, 1913 (original description)
Neidium affine var. maxima (Cleve) Mayer, 1913 (new combination reference)