PLATE GIL 



FIGS. PAGE 



14. Cosmarium amo-num Ralfs. 1 and 3, x 500 ; 



2, x 520 ; 4, x 400 . . . 29 



5-6. C. amoenum var. mediolseve Nordst. 5, x 625 ; 



6, x 570 (after Nordstedt) . . 31 



7-9. C. pseudamoenum Wille. 7, x 480 (after Wille) ; 



8, x 600 (after Joshua) ; 9, 500 . . 31 



10-12. C. pseudamoenum var. basilare Nordst. 10, x 



570 (after Nordstedt) ; 11, x 520; 12, x 500 32 

 13-15. C. annulatum (Nag.) De Bary. 13, x 600 

 (after Nageli) ; 14, three individuals forming 

 a short chain, x 400; 15, x 500 . . 39 



16-18. C. annulatum var. elegant Nordst. 16, x 570 



(after Nordstedt) ; 17, x 400; 18 x 500 . 40 

 19. C. elegantissimum Lund. x 400 (after Luiidell) 40 

 20-21. C. elegantissimum forma minor West. 20, x 



400; 21, x 500 . . .41 



22. C. punctulatum Breb. Zygospore, x 500. 

 [Consult Vol. Ill, page 207.] 



