REMARK: Todd did not separate them, it its questionnable what N. atomus var. permitis actually is!
Phycology Section, Patrick Center for Environmental Research, Academy of Natural Sciences of Drexel University. Navicula atomus var. permitis (NADED 46724). https://diatom.ansp.org/taxaservice/ShowTaxon1.ashx?naded_id=46724. Accessed 24 Apr 2019. This web service reports all information about a given algae taxon available at the time of retrieval.