PLATE LXII. 



FIGS. PAGE 



1. Cosmarium tetraclwndrmn Lund, x 400 (after 



Lundell) . . . .175 



2-5. C. depressum (Nag.) Lund. 2, x 300 (after 

 Xao-eli) ; 3 and 4, x 416 (after Delponte) ; 

 5, x 520 . . .176 



6-9. C. depressum var. achondrum (Boldt) West & 

 G. 8. West. 6, x 400 (after Boldt); 7-9, 

 x 520 . . . . 177 



10. C. depressum var. reniformt West & G. 8. West. 



x 520 . . . . 178 



1113. ~C. subquadrans West & Gr. 8. West. 11, x 



500; 12 and 13, x 400 . . . 178 



14-16. C. succisum West. 14, x 400; 15 and 16, x 



520 . . . . . 179 



17-18. C. retusiforme (Wille) Gutw. 17, x 480 (after 



Wille) ; 18, x 520 . . .180 



19. C. subretusifurme West & a. 8. West, x 830 . 180 

 20-21. C. Hammeri Reinsch. 20, x about 550 (after 



Reinsch) ; 21, x 520 . . .181 



22-23. C. Hammeri var. homalodermum (Nordst.) West 

 & Gr. 8. West. 22, x 400 (after Xordstedt) ; 

 23, x 330 (after Wille) . . . 182 



24-25. C. Hammeri var. protuberans West & Gr. 8. 



West, 24, x 520; 25, zygospore, x 400 . 183 

 26-27. C. Nymannianum Grim. x 520 . . 184 



28-30. C. trilobulatum Reinsch. 28 and 29, x 520; 



30, x about 1260 (after Reinsch) . . 185 



