FIGURES 69–84 in New diatoms (Bacillariophyta) from western North America

FIGURES 69–84: Navicula supleeorum, Navicula trilatera. Figs 69–75: Navicula supleeorum from Rock Creek, Valley County, Montana (type locality). Fig. 72: Holotype specimen. Figs 76–84: Navicula trilatera from Blakiston Beaver Pond A, Waterton Lakes National Park, Alberta (type locality). Figs 76–82: LM images. Fig. 78: Holotype specimen. Figs 83, 84: SEM images. Fig. 83: External valve view showing lineate striae and distal raphe ends hooked toward the same (secondary) side of the valve. Fig. 84: Internal valve view showing thickened raphe sternum and distal raphe ends terminating in helictoglossae. Scale bars: Figs 69–82: 10 µm; Figs 83, 84: 5 µm.