FIGURES 59–64 in Transfer of Fragilaria atomus Hust. to the genus Stauroforma (Bacillariophyta) based on observation of type and newly collected material

FIGURES 59–64. SEM: Stauroforma atomus comb. nov. from Brazil. Figs 59–60, 63–64. External view of valve showing head-pole (white arrow) and foot-pole (black arrow). Fig. 61. Detail of foot-pole with the poroids of the apical pore field (arrow) and areolae containing a slightly branched structure. Fig. 62. Detail of curved striae with different sizes at head-pole (arrow). Scale bars = 1 µm (Figs 59–60, 63–64), 0.5 µm (Figs 61–62).