FIGURES 47–51 in Three new species of Ulnaria (Bacillariophyta) from the Wuling Mountains Area, China

FIGURES 47–51. Ulnaria ulnabiseriata sp. nov., SEM. 47. One pole in girdle view showing the ocellulimbus and the pore closing plates. 48. A whole valve. 49–51. Details of the previous whole valve. Scale bar =1 μm (Fig. 47), 10 μm (Fig. 48), 5 μm (Figs 49–51).