Van de Vijver, B., Williams, D.M., Kusber, W.-H., Cantonati, M., Hamilton, P.B., Wetzel, C.E. and Ector, L. (2022) Fragilaria radians (Kützing) D.M.Williams et Round, the correct name for F. gracilis (Fragilariaceae, Bacillariophyta): a critical analysis of this species complex in Europe. Fottea 22(2): 256-291.