FIGURES 116–119 in New and Interesting Diatoms (Bacillariophyta) from Blue Lake Warm Springs, Tooele County, Utah

FIGURES 116–119. SEM. Mastogloia variabilis. External views of three specimens. Fig. 116, Full valve view showing undulate raphe branches and especially protracted apices. Fig. 117, Specimen with large central area and many depressions on the central area. Fig. 118, Large, deflected distal raphe end, free of striae. Fig. 119, Central area showing dilated proximal raphe ends. Scale bars: Figs 116–117: 10 µm; Figs 118–119: 1 µm.