Explanation of Plates. 



PLATE XXI. 



(All Figures X 500.} 



UROMYCLADIUM MARITIMUM. 

 Fig. 



177. Two young teleutospore heads, arising from common stalk, the one on the 



right being younger than that on the left, and both intermediate between 

 T2 and T3 in next figure. (Stained.) 



178. Main stem, bearing teleutospore heads in various stages of development; T, 



filament with two septa, the upper two segments destined to become teleuto- 

 spores, the lowermost a vesicle ; TI, similar filament, somewhat more ad- 

 vanced, the vesicle beginning to push out from the lowermost segment; T2, 

 similar filament still more advanced, the uppermost cell distending, in the 

 next growth is taking place at the side, and in the lowest the vesicle has 

 attained considerable development ; T3, nearly mature head, with two dark 

 teleutospores ; U, basidium of a detached uredospore. (Stained.) 



179. Abnormal teleutospore head of three teleutospores, a septum beneath the lower- 



most. 



r8o. Normal teleutospore head, with two teleutospores above septum and a vesicle 

 below, there being no septum below the vesicle. 



181. Teleutospore head in which the vesicle is apparently at the apex, but this is 



probably due to displacement in mounting. 



182, 183. Normal teleutospore heads. 



184. Uredospores with prominent germ pores, serrated epispore thickened and dentat( 

 at apex. 



