Observations on the type material of Synedra vaucheriae var. septentrionalis Østrup (Fragilariaceae, Bacillariophyta) and its transfer to the genus Fragilaria
B. Van de Vijver, N. Lundholm, C. Lange, C. E. Wetzel, and L. Ector
Notulae Algarum, vol. 157, pp. 1-4, 2020
http://www.notulaealgarum.com/2020/documents/Notulae%20Algarum%20No.%20157.pdf