FIGURES 49–55 in New and Interesting Diatoms (Bacillariophyta) from Blue Lake Warm Springs, Tooele County, Utah

FIGURES 49–55. SEM. Ulnaria tooelensis. Internal and external valve views of five specimens. Fig. 49, Full external valve view showing rimoportula openings at each end. Fig. 50, Full external valve showing unpaired striae. Fig. 51, Apex showing small, round, depressed external opening of the rimoportula and the ocellimbus. Fig. 52, Large external central area with slightly thickened interstriae and small, unoccluded areolae. Fig. 53, Full internal view showing rimoportulae at each apex. Fig. 54, Small, rounded rimoportula and well-defined apical pore field which extends over a larger area than the external ocellimbus. Fig. 55, Internal view of the central area with unoccluded areolae. Scale bars: Figs 49–50, 53: 10 µm; Figs. 51–52, 54–55: 1 µm.