FIGURES 158–164 in The biogeographic distribution of Cavinula (Bacillariophyceae) in North America with the descriptions of two new species

FIGURES 158–164. SEM micrographs of Cavinula pseudoscutiformis (Hustedt) Mann & Stickle. Figs 160, 162–164.C. pseudoscutiformis (Morphotype). Figs 158, 160, 162. External valve view. Figs 159, 161, 163, 164. Internal valve view. Figs 158, 159, 161. Kernville, California, USA. Figs 160, 163, 164. Clear Lake Oakley TWP: Sediment core from the deepest part of the lake, Muskoka District, Ontario, Canada. Fig. 162. sediment core, Lac de Gras, Nunavut, Canada. Scale bars: 5 µm in Figs 162, 163; 2 µm in Figs 158, 159, 160, 161. 1 µm in Figs 164.