PLATE XX. 
L_| 






181 
| 5O MIcRONns 

Page 
Figs. 179 and 180. Oedogonium pachyandrium Wittr. (Redrawn from Hirn).. 84 
Figs. 181-183. Oe. subrectum Hirn. (Redrawn from Hirn).................. 87 
Figs. 184 and 185. Oc. oboviforme Wittr. (Redrawn from Hirn).............. 86 
Fig. 186. Oc. pseudoboscii Hirn. (Redrawn from Silfvenius)................. 76 
Fig. 187. Oc. lageniforme Hirn. (Redrawn from Hirn)...................... 168 
