PLATE CLXV. 



FIGS. PAGE 



1-2. Desmidium coarctatum Nordst. 1, X 400 (after 



Nordstedt) ; 2, X 520 . . .252 



3-4. D. coarctatum var. cambricum West. X 400 . 252 



5-6. D. pseudostreptonema W. & G. S. W. 5, flattened 



form, X 520 ; 6, trigonal form, X 520 . 244 



7. D. Swartzii var. amblyodon (Itz.) Rabenh. X 510. 249 



8-9. Gymnozyga moniliformis Ehr. 8*, X 510 ; 9, ver- 

 tical view, X 400 (after Ralfs) . . 255 

 10. G. moniliformis var. gracilescens Nordst. Zygo- 



spores, X 520 .... 256 



