EXPLANATION OF THE FIGURES. 



PLATE XIX. 



Puccinia graminis. Pers. 



Fig. I. Wheat stem and leaf with teleuto-spores . x f 

 2. Ureao-spores. The one on the right has developed two germ-tubes. 



Highly magnified. 

 ,. 3- Ideuto-spores. The one on the right has germinated, the upper cell 



producing a pro-mycelium (a) from which spring sterigmata, bearing 



sporidia (J). Highly magnified. 

 4- Under-surface of leaf of Serberis Lycium showing the ceci&ia on a dark 



brown patch, x \. 



5. An open aecidium from above. Magnified. 

 6. Transverse section (of Berleris leaf, (a), is lower surface of leaf. Two 



secidia are shown, one of which has not yet burst through the leaf 



epidermis. Highly magnified. 



