Diatoma anceps var. deformis Mayer, 1940 (original description)
Diatoma anceps var. genuinum Mayer, 1940 (original description)
Diatoma anceps var. subconstrictum Mayer, 1940 (original description)
Diatoma elongatum f. caudata Mayer, 1940 (original description)
Diatoma elongatum f. majus Mayer, 1940 (original description)
Diatoma elongatum f. mesolepta (Kützing) Mayer, 1940 accepted as
Diatoma mesoleptum Kützing, 1844 (new combination reference)
Diatoma elongatum f. minus (Grunow) Mayer, 1940 accepted as
Diatoma tenue var. minus Grunow, 1862 (new combination reference)
Diatoma elongatum f. minus (Kützing) Mayer, 1940 accepted as
Diatoma tenue var. cuneatum Kützing, 1833 (1834) (new combination reference)
Diatoma elongatum f. minus (Mayer) Mayer, 1940 accepted as
Diatoma tenue var. inflata Mayer, 1919 (new combination reference)
Diatoma elongatum f. minus inflata (Mayer) Mayer, 1940 accepted as
Diatoma tenue var. inflata Mayer, 1919 (new combination reference)
Diatoma elongatum f. typica Mayer, 1940 (original description)
Diatoma elongatum f. typica caudatum Mayer, 1940 (original description)
Diatoma elongatum var. genuinum Mayer, 1940 (original description)
Diatoma hiemale f. inaequalis Mayer, 1940 (original description)
Diatoma hiemale f. rotundata Mayer, 1940 (original description)
Diatoma hiemale f. typica Mayer, 1940 (original description)
Diatoma hiemale var. acutiforme Mayer, 1940 (original description)
Diatoma hiemale var. acutum Mayer, 1940 (original description)
Diatoma hiemale var. truncatum Mayer, 1940 (original description)
Diatoma vulgare f. asymmetrica (Meister) Mayer, 1940 accepted as
Diatoma grande var. asymmetrica Meister, 1912 (new combination reference)
Diatoma vulgare f. caudatum Mayer, 1940 accepted as
Diatoma vulgaris f. caudatum Mayer, 1940 (original description)
Diatoma vulgare f. deforme Mayer, 1940 accepted as
Diatoma vulgaris f. deforme Mayer, 1940 (original description)
Diatoma vulgare f. flectata Mayer, 1940 accepted as
Diatoma vulgaris f. flectata Mayer, 1940 (original description)
Diatoma vulgare f. genuinum Mayer, 1940 accepted as
Diatoma vulgaris f. genuinum Mayer, 1940 (original description)
Diatoma vulgare f. subconstricta Mayer, 1940 accepted as
Diatoma vulgaris f. subconstricta Mayer, 1940 (original description)
Diatoma vulgare f. subrotunda Mayer, 1940 accepted as
Diatoma vulgaris f. subrotunda Mayer, 1940 (original description)
Diatoma vulgare f. terminans Mayer, 1940 accepted as
Diatoma vulgaris f. terminans Mayer, 1940 (original description)
Diatoma vulgare f. typica Mayer, 1940 accepted as
Diatoma vulgaris var. grande f. typica Mayer, 1940 (original description)
Diatoma vulgare f. typica Mayer, 1940 accepted as
Diatoma vulgaris var. brevis f. typica Mayer, 1940 (original description)
Diatoma vulgare var. caudatum Mayer, 1940 accepted as
Diatoma vulgaris var. caudatum Mayer, 1940 (original description)
Diatoma vulgare var. oblongum Mayer, 1940 accepted as
Diatoma vulgaris var. oblongum Mayer, 1940 (original description)
Diatoma vulgare var. tenuicolle (Mayer) Mayer, 1940 accepted as
Diatoma vulgare f. tenuicollis Mayer, 1919 accepted as
Diatoma vulgaris f. tenuicollis Mayer, 1919 (new combination reference)
Eunotia polydentula var. monodon (Mayer) Mayer, 1940 (new combination reference)