Plate II. — The Ci'krant and Pine Rust. 



Cronartium ribicola. 



1, Uredo and teleutospore stages on loaf of black currant; 2, Dredo- 

 spores, a, and tclutospores, ~b, cemented together to form an erect, 

 hairlike structure (XoO); 3, Urodospore, (X300) ; 4, Four teluto- 

 spores, two of which are germinating, and one of the germ-tubes has 

 produced four sporidia or secondary spores (X300) ; 5, Aecidia on bark 

 of white pine; 6, Aecidiospores (X300). (After Massee.) 



