new combination referenceBoyer, C.S. (1900). The Biddulphoid forms of North American Diatomaceae. Proceedings of the Academy of Natural Sciences of Philadelphia, 1900: 685-748 page(s): p. 711 [details]
new combination referenceWolle, F. (1890). Diatomaceae of North America, Illustrated with twenty-three hundred figures from the Author's drawings on one hundred and twelve plates. Comenius Press; Bethlehem, Pennsylvania, U.S.A., 112 pls., available online athttps://doi.org/10.5962/bhl.title.1626 page(s): pl. 97, fig. 9 [details]