2 7 6 



Explanation of Plates. 



PLATE XVIII. 



(All Figures X 250 unless otherwise stated.} 



UROMYCES. 

 Fig- 



150. Uredospores of Uromyces polygoni on Polygomim aviculare. 



151. Teleutospores of same. 



152. Uredospores of U. caryo-phyllinus on Dianthus caryo-phyllus, with prominent 



scattered germ pores. 



153. Teleutospores and one uredospore of same. 



154. Section through leaf of Dianthus caryo-phyllus, showing uredosorus of U '. caryo- 



phyllimts with two pycnidia of Darluca filum growing upon it, and two 

 young pycnidia on opposite surface of leaf ... ... X 5 



155. Uredospores of U. -uesiculosus on Zygo-phyllnm glaucesccns. 



156. Teleutospores of same. 



157. Two-celled teleutospore of same. 



