
PLate VIII—THE Currant AND Pine Rust. 
Cronartium ribicola. 
1, Uredo and teleutospore stages on leaf of black currant; 2, Uredospores, a, and 
teleutospores, 6, cemented together toform an erect, hairlike structure (X50); 
3, Uredospore, (300); 4, Four teleutospores, 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.) 
