46 Chlorocystis Sarcophyci. 



EXPLANATION OF PLATE XII. 



Fig. i. Sarcophycus potatorwn. Male conceptacle ( x 105). 

 Fig. 2. ,, Female conceptacle ( x 105). 



Fig. 3. ,, Oogonia developed on branching filaments : a, b, c, 



being stages in the formation of oospheres 

 ( x 440). 

 Figs. 4, 5, 6. Chlorocystis Sarcophyci. Malformations on frond of Sarcophycus 



fotatorum. Nat. size. 

 Fig. 7. ,, Section of malformations, first stage, showing 



endophytic cells ( x 105). 

 Fig. 8. ,, Section showing the endophytic cells escap- 



ing by the decomposition of the cortical 



filaments ( x 105). 

 Fig. 9. ,, ., Section of the disorganized tissue after the 



escape of the endophyte ( x 105). 

 Fig. 10. ,, Group of endophytic cells : a, contents 



undivided ; ^, larger segments ; c, spores 



Fig. ii. Group of spore-containing cells ( x 440). 



