78 



The following is the dimensions of the median sized spores of this 



fungus. 



(length . 

 Uredospore | Wth- 



(length . 

 Teleutospore j wth _ 



Diameter of Sporidium 



Aecidiospore \ _ .,,, 

 (breadth . 



Spermatium \ ' ° , . 

 ( breadth . 



24 p. 

 193 ft. 



33.6 ft. 

 14.4 ft. 



9.6 ft. 

 28.8 ^ 



2.16 ft. 

 •5/i 



2/t. 



Fig. 1. 

 Fig. 2. 

 Fig. 3. 



Fig. 4. 

 Fig. 5. 

 Fig. 6. 



Explanations of the Plates. 



Plate IV. 



Aecidium layer exposed, by taking off the overlying corky bark of 



the excrescence of a diseased branch of Finns densiflwa. 



Transverse section of a diseased branch through the excrescence, 



showing the annual growth of the diseased tissue. 



A portion of transverse section of a diseased branch of Finns 



densiflora magnified ; K, corky bark ; S, spermogonium layer ; F, 



pseudoperidium ; A, aecidium layer ; R, cortical parenchyma, 0, 



cambium layer ; D, new wood ; E, prolongations of meduallary 



rays. 



Portion of cortex and spermogonium layer magnified, x 200. 



Portion of aecidium layer magnified, x 200. 



Aecidiospores magnified. 



Plate V. 



Fig. 7. Leaf of the seedling of Q glandulifera used in the experiment, 



with the group of uredolayers formed in its under surface, seen 



10 days after infection. 

 Fig. 8. Leaf of Q glandulifera in the open air with teleutospores 



produced by natural infection. 

 Fig. 9. Leaf of Q. serrala, used in the experiment with uredolayers 



seen 10 days after infection. 



