PLATE XXV. 



FIGS. PAGE 



1-3. Closterium decorum Breb. 1 and 2, x 208 



(after Delponte) 3, x 520 . .184 



4-5. Cl. lateral* Nordst. 4, x 220 ; 5, x 520 . 186 

 6-11. Cl. Kiit-inti-u Breb. 6, x 500; 7-9, x 520; 



10 and 11, zygospores, x 400 . . lxr> 



12-13. Cl. Kiitzingii var. vittatum Nordsi. x 520 . iss 



