Plate 73 



Figs. 1-3. Spirogyra subsalsa Kuetzing: 1, x 100; 2 and 3, x 500 



Figs. 4, 5. Spirogyra fluviatilis Hilse, x 230 



Fig. 6. Spirogyra Fuellehornei Schmidle, x 200 



Figs. 7, 8. Spirogyra Juergensii Kuetzing: 7, x 325; 8, x 500 



Fig. 9. Spirogyra micropunctata Transeau, x 240 



Fig. 10. Spirogyra nitida ( Dillw. ) Link, x 137 



[806 J 



