FIGURES 33–38 in Additional morphological features of the epiphytic diatom Cocconeis sawensis Al-Handal & Riaux-Gobin (Cocconeidaceae, Bacillariophyta) from a coastal lagoon, Southern Brazil

FIGURES 33–38. Hymenes of sternum valves of Cocconeis sawensis from Brazil. TEM. 33, 34. Hymenes with very small and rounded perforations becoming linear slits at the margin. 35–37. Hymenes with fine transverse slits with some small-rounded in the middle. 38. Hymenes degraded. Scale bars = 200 nm (Fig. 33), 0.2 μm (Figs 34–38).