Ruth E. Holland 1965 The principal diatoms collected at 14 stations in Lake Superior were <i>Cyclotella "glomerata-stelligera"</i> [= <i>C. glomerata</i> and <i>C. stelligera</i> combined], <i>Cyclotella "ocellata-kutzingiana", Fragilaria crotonensis</i>, and <i>Rhizosolenia eriensis</i>. Concentrations were heaviest in the Apostle Islands region (up to 2,160 per ml) and lightest northwest of the Keweenaw Peninsula (68 to 78 per ml). Species composition differed in different parts of the lake. application/pdf en Institute of Science and Technology, University of Michigan The distribution and abundance of planktonic diatoms in Lake Superior text