FIGURES 55–66 in Ultrastructure of four Surirella taxa (Bacillariophyceae) from Qinghai Province, northwest China, with reference to the characteristics of portulae

FIGURES 55–66. Surirella lacrimula, LM (1000×). 55–66. Twelve different valves showing the size diminution series. Note the ovate valve outline, the recognizable central and outside portions of the valve (labeled in Fig. 59), and the discernible costa-stria bundles (CBSs) within the outside portion. Scale bar = 10 μm (in Fig. 55).