PLATE 31 
Cronartium nbicola: 
A. —A tangential section showing strands of hyphae among the white-pine host cells. 
Note the haustoria. In the tipper left-hand comer a haustorium can be seen denting 
the host nucleus. X 325. 
B. —A haustorium showing the characteristic bend and irregular outline. The sec¬ 
tion just missed the connection of the haustorium with the hypha outside the cell. 
The host nucleus was tom by the razor. X 1,250. 
These figures illustrate excellently the relation of the parasite to the host in the 
phloem parenchyma. Photomicrographs by the writer. 
