Explanation of Figures in Plate I. 



All figures, except Figs. 1, 7-9, are drawn with the aid of a 

 camera lucida from the fresh specimens. 



Fig. 1. The first appearance of the diseased pale yellowish 

 spots on a young leaf, especially along the veins. At the centre of 

 some spots is visible orange coloured fungus body. 



Fig. 2. Cross section of a leaf showing a young fungus bo:ly 

 in a mesophyll cell. 



Fig. 3. Cross section of a leaf showing two full grown fungus 

 bodies about to form sporangia. 



Fig. 4. A portion of a young sporangium-sorus. 



Fig. 5. Cross section of a leaf showing swollen parenchyma 

 round a mature sporangium-sorus. 



Fig. 6. A portion of a ruptured sorus and much elongated 

 parenchymatous cells round it. 



Fig. 7. Galls on the stem. 



Fig. 8. Cross section of a stem showing nine sporangium-sori 

 in the cortex. 



Fig. 9. Ruptured galls on the stem (observed at April 28th. 

 1904), 



Fig. 10. Mature sporangia set free. 



Fig. 11. Formation of swarm-spores in sporangia. 



Fig. 12. Sporangivim about to dehisce. 



Fig. 13. Swarm-spores. 



Fig. 14. Swarm-spores at rest. 



Fig. 15. Empty sporangium with round thinner portions at 

 the centre of the polygonal planes. 



Fig. 16. The same stained by gentian violet. 



