FIGURES 1–14 in Ultrastructure of four Surirella taxa (Bacillariophyceae) from Qinghai Province, northwest China, with reference to the characteristics of portulae

FIGURES 1–14. Surirella liubingii sp. nov., LM (1000×). Fourteen different valves showing the size diminution series of this species. Note that the costa-stria bundles (CSBs) do not reach the valve margins because the internal wall of the raphe canal grows into the cell cavity to form a "pseudoseptum" from the valve margin (indicated by two arrows in Fig. 4). Fig. 1 corresponds to holotype specimen. Scale bar = 10 μm (in Fig. 1).