Plate 122 



Figs. 1, 2. Wollea saccata (Wolle) Bornet & Flahault: 1, habit, 



X %; 2, X 750 



Figs. 3-5. Nodularia spumigena Mertens, x 900 



Figs. 6-8. Aphanizomenon flos-aquae (L. ) Ralfs: 6, x 225; 7 and 

 8, X 750 



Figs. 9, 10. Cylindrospermum catenatum Ralfs, x 750 



Figs. 11, 12. Cylindrospermum majus Kuetzing, x 900 



Fig. 13. Cylindrospermum Marchicum Lemmermann, x 1050 



Figs. 14, 15. Cylindrospermum minimum G. S. West, x 900 



Fig. 16. Cylindrosper7Jium 7nuscicolo Kuetzing, x 660 



Figs. 17, 18. Cylindrospermum stagnale ( Kuetz. ) Bornet & Fla- 

 hault: 17, X 400; 18, x 750 



(904 J 



