Explanation of Plates. 



PLATE H. 



(Natural Size.) 



UROMYCES BETAE ON MANGEL (Beta vulgaris). 

 Fig. 



35. Uredo and teleutosori on under surface of leaf. 



This leaf was obtained from Mangels, the roots of which had been planted in 

 August for seed, and in January the plants were fully six feet high, with abundance 

 of foliage covered on both sides with rust. 



