Jüttner, I., Wetzel, C.E., Van de Vijver, B., Levkov, Z., Chudaev, D., Williams, D.M. and Ector, L. (2023) Investigation of the type material of Microneis gracillima, Navicula pyrenaica, Achnanthes amphicephala, Achnanthes thienemannii and Achnanthidium rostropyrenaicum (Achnanthidiaceae, Bacillariophyta) and additional populations of the species Fottea, Olomouc 23(1): 122-140.