Figs 12–16 in Morphology of two Mastogloia species (Bacillariophyta) from Lac de Guiers (Senegal) and comparison with the type material of M. braunii

Figs 12–16. Mastogloia braunii Grunow. Scanning electron micrographs (SEM) of valves from the type population (Grunow 23583 – capsule 0645, Vienna, Austria). 12. SEM internal view of an entire valve with the partectal ring and series of partectal pores. 13. SEM internal detail of the partecta with the flange connecting the partecta with the valve margins. 14. SEM internal detail of the partecta showing the partectal walls with 2–4 series of small, rounded pores. 15–16. SEM internal details of the partectal ring near the valve apices showing the cleft with the lacunae. Scale bars: 12 = 1 µm; 13–16 = 10 µm.