Plate 126 



Figs.l, 2. Tolypothrix lirnbata Thuret: 6, x 470; 2, x 1350 



Fig. 3. Diplonema rupicola Borzi, x 570 



Figs. 4, 5. Plectonema nostocorum Bornet, x 1000 



Figs. 6, 7. Plectonema notatum Schmidle: 6, x 2440; 7, x 750 



Fig. 8. Plectonema purpureum Gomont, x 750 



Fig. 9. Plectonema tentie Thuret, x 750 



[912] 



