Caloneis bacillum f. fasciata (Cleve) Mayer, 1939 accepted as
Navicula fasciata var. fasciata Lagerstedt, 1873 (new combination reference)
Caloneis bacillum f. fonticola (Grunow) Mayer, 1939 accepted as
Navicula fonticola Grunow, 1880 (new combination reference)
Caloneis bacillum var. fasciata (Cleve) Mayer, 1939 accepted as
Navicula fasciata var. fasciata Lagerstedt, 1873 (new combination reference)
Caloneis diversistriata Mayer, 1940 (original description)
Caloneis silicula var. gibba Mayer, 1939 (original description)
Cymbella cuspidata var. lanceolata Mayer, 1940 (original description)
Cymbella cuspidata var. rostrata (Rabenhorst) Mayer, 1940 accepted as
Cymbella rostrata Rabenhorst, 1853 (new combination reference)
Cymbella heteropleura var. minor Mayer, 1939 (original description)
Encyonema ventricosum f. lunula (Hilse) Mayer, 1939 (new combination reference)
Gomphonema angustatum f. productum (Grunow) Mayer, 1939 (new combination reference)
Melosira italica var. muzzanensis (Meister) Mayer, 1939 (new combination reference)
Meridion circulare var. zinckeni (Kützing) Mayer, 1939 (new combination reference)
Navicula bacilliformis var. nuda Mayer, 1940 (original description)
Neidium affine f. subrostrata Mayer, 1940 (original description)
Pinnularia brevicostata var. leptostauron sensu Mayer, 1940 (original description)
Pinnularia hemileptogongyla Mayer, 1940 (original description)
Pinnularia hemistreptoraphe Mayer, 1940 (original description)
Pinnularia leptogongyla f. cruciata Mayer, 1940 (original description)
Pinnularia leptogongyla f. leptogongyla sensu Mayer, 1940 (original description)
Pinnularia leptogongyla var. cruciata Mayer, 1940 (original description)
Pinnularia leptogongyla var. linearis Mayer, 1940 (original description)
Pinnularia leptosoma f. elangensis Mayer, 1940 (original description)
Pinnularia leptosoma var. subinflata Mayer, 1940 (original description)
Pinnularia microstauron f. minuta Mayer, 1939 (original description)
Pinnularia pseudoleptogongyla Mayer, 1940 (original description)
Pinnularia reinschiana Mayer, 1939 (original description)
Pinnularia semidistingenda Mayer, 1940 (original description)
Pinnularia semiflexuosa Mayer, 1940 (original description)
Pinnularia semimaior Mayer, 1940 (original description)
Pinnularia semitransversa Mayer, 1940 (original description)
Pinnularia semiviridis Mayer, 1940 (original description)
Pinnularia stomatophoroides var. erlangensis Mayer, 1939 (original description)
Pinnularia stomatophoroides var. stomatophoroides Mayer, 1940 (original description)
Pinnularia transversa var. linearis Mayer, 1940 (original description)
Pinnularia transversa var. nobiliformis Mayer, 1940 (original description)
Pinnularia transversa var. transversa (Schmidt in Schmidt et al.) Mayer, 1940 accepted as
Navicula transversa A.Schmidt, 1876 (new combination reference)
Pinnularia viridicreata Mayer, 1940 (original description)
Pinnularia viridis f. constricta Mayer, 1940 (original description)
Pinnularia viridis f. cruciata A. Mayer, 1911 (original description)
Pinnularia viridis f. cuneata (Østrup) Foged, 1972 accepted as
Pinnularia flexuosa var. cuneata Østrup, 1910 (new combination reference)
Pinnularia viridis f. interrupta Mayer, 1939 (original description)
Pinnularia viridis var. fallax sensu Mayer, 1940 (original description)
Pinnularia viridis var. linearis Mayer, 1940 (original description)
Pinnularia viridis var. sudetica (Hilse) Hustedt, 1930 accepted as
Navicula sudetica var. sudetica Hilse, 1860 (new combination reference)
Stauroneis crumenifera Mayer, 1940 (original description)
Stauroneis franconica Mayer, 1940 (original description)
Surirella robusta f. maxima Mayer, 1939 (1940) (original description)
Synedra parasitica var. rhomboidalis Mayer, 1939 (1940) (original description)
Synedra ulna var. joursacensis (Heribaud) Mayer, 1939 accepted as
Synedra joursacensis Héribaud-Joseph, 1903 (new combination reference)