Plate 75 



Figs. 1-3. Spirogyra novae-angliae Transeau: 1 and 2, x 160; 3, x 

 340 



Figs. 4-6. Spirogyra pratensis Transeau: 4 and 5, x 450; 6, x 340 



Figs. 7-9. Spirogyra pseiidofloridana Prescott, x 250 



Fig. 10. Spirogyra porticalis (Muell.) Cleve, x 400 (after Smith) 



[810] 



