PLATE I 
Fig. 
1. Conidia of Cystopus tvagopogonis, Schroet; mag. 
2. Oospore of same; mag. 
3. Conidial stage of Basidiophora entospora, Roze and Cornu ; mag. 
4. The same, showing the escape of zoospores from a coridium 
or zoosporangium ; mag. 
5. Free zoospores of same; mag. 
6. Oospore of same ; mag. 
7. Plasmopava pygmaea, Schroet; conidial stage ; mag. 
8. Single conidium of same ; mag. 
9. Pythium deharyanum, Hesse ; {a) cc'nidium or zoosporangium 
liberating zoospores; ip) oosphere being fertilised by an 
antheridium ; (c) chlamydospore or resting-spore ; mag. 
10. * Free zoospore of same ; mag. 
11. Phytophthora injestans, De Bary, conidial stage; mag. 
12. Conidium or zoosporangium of same ; mag. 
13. Free zoospore of same ; mag. 
14. Mycelium of same from tuber of a potato, haustoria are entering 
the cells from the mycelium running between the cell walls ; 
mag. 
15. Oospore of Cystopus candidus, Lev. ; mag. 
16. Conidial stage of Sclerospora gyaminis, Schroet. ; mag. 
17. Premia lactucae, Regel, showing expanded tip of a branch of 
conidial stage bearing conidia ; mag. 
18. Conidial form of Peronospora urticae, De Bary ; mag, 
19. Mycelium of Cystopus candidus, Lev., giving off haustoria 
into the cells of the post-plant; mag. 
