Melosira sulcata f. barbadensis (Schmidt in Schmidt et al.) Hanna, 1969 (new combination reference)
Melosira sulcata f. siberica (Schmidt in Schmidt et al.) Hanna, 1969 (new combination reference)
Navicula graeffii var. minor (Cleve) Hanna, 1969 (new combination reference)
Navicula interrupta var. stauroneiformis (Schmidt) Hanna, 1969 accepted as
Navicula termes var. stauroneiformis A.W.F.Schmidt, 1876 (new combination reference)
Navicula mutica var. robusta (Hustedt in Schmidt et al.) Hanna, 1969 accepted as
Navicula kotschyi var. robusta Hustedt in Schmidt et al., 1930 (new combination reference)
Navicula mutica var. undulata (Hustedt) Hanna, 1969 (new combination reference)
Navicula placida var. maxima (Cleve in Schmidt et al.) Hanna, 1969 accepted as
Diploneis muscaeformis var. maxima Cleve in Schmidt et al., 1892 (new combination reference)
Trigonium multifrons f. stricta (Hustedt in Schmidt et al.) Hanna, 1969 (new combination reference)