Plate 30 



Figs. 1, 2. Oedogonium australe (G. S. West) Tiffany, x 500 



Figs. 3, 4. Oedogonium giganteum Kuetzing: 3, x 220; 4, x 590 



Figs. 5, 6. Oedogonium Boscii ( Le CI. ) Wittrock, x 285 



Fig. 7. Oedogonium crenulatocostatum Wittrock, x 590 



Figs. 8-10. Oedogonium Kjellmanii var. granulosa Prescott: 8, x 

 285; 9, X 440; 10, x 285 



Figs. 11, 12. Oedogonium exocostatum Tiffany: 11, x 500; 12, x 275 



Figs. 13-15. Oedogonium crenulatocostatum var. cylindricum 

 (Hirn) Tiffany: 13, x 275; 14, x 590; 15, x 275 



[720] 



