FIGURES 14–19 in Three new species of Ulnaria (Bacillariophyta) from the Wuling Mountains Area, China

FIGURES 14–19. Ulnaria sinensis sp. nov., external view, SEM. 14. One apex of a valve, note the rostrate end. 15. The middle part of a valve, note the parallel both sides. 16. Magnification of the previous apex. 17. Magnification of the previous middle part, note the linking spines (arrows) and the alternate striae (double-head arrow). 18. Magnification of an apex. 19. One pole showing the ocellulimbus and the pore closing plates. Scale bars =10 μm (Figs 14, 15), 5 μm (Figs 16–18), 1 μm (Fig. 19).