280 



Explanation of Plates. 



Fi?. 



166. 



PLATE XX. 



(All Figures X 250.) 

 UROMYCLADIUM MARITIMUM. 



Section of teleutosorus of U. maritimum on Acacia longifolia, the mature 

 teleutospores having the remains of the vesicles attached to the pedicels. 



167. Group of mature teleutospores of the same. 



168. Formation of teleutospore head ; a young cluster, showing the two young spores 



at the apex, and the lateral vesicle below the septum. (Stained.) 



169. 170. Similar heads, more advanced. (Stained.) 



171. Mature teleutospore head, two teleutospores above and one vesicle below. 



172. Abnormal development of head of teleutospores, the lateral vesicle being re- 



placed by a true spore, and a septum placed in the stalk beneath it. In the 

 normal head of two spores and a vesicle there is no septum below the vesicle. 



173. Teleutospores germinating while still attached to each other ; two sporidiola on 



one promycelium, others so far undeveloped. 



174. Uredospores with prominent equatorial germ pores and serrated epispore, 



thickened and dentate at apex. 



175. One-celled spores (mesospores ?), occasionally found ' intermixed with uredo- 



spores. 



176. Immature two-celled colourless spore, of same character, from .uredosorus. 



(Stained). 



