Observations on and typification of Synedra crotonensis f. belgica Grunow and Fragilaria crotonensis var. prolongata Grunow (Fragilariaceae, Bacillariophyta) and the introduction of Fragilaria prolongata comb. nov. et stat. nov.
B. Van de Vijver, C. E. Wetzel, W.-H. Kusber, and L. Ector
Notulae Algarum, vol. 166, pp. 1-6, 2020
https://notulaealgarum.org/2020/documents/Notulae%20algarum%20No.%20166.pdf