Wetzel, C.E. and Ector, L. 2014. Planothidium lagerheimii comb. nov. (Bacillariophyta, Achnanthales) a forgotten diatom from South America. Phytotaxa. 188, 5 (Dec. 2014), 261–267. DOI:https://doi.org/10.11646/phytotaxa.188.5.3.