532 DISEASES OF CULTIVATED PLANTS 



cultivated plant than potatoes, alternation of crops is 

 suggested. 



Berkeley, M. ].,/ourn. Hort. Soc, i, p. 9, pi. 4 (1846). 

 Berkeley, M. J., Ann. Mag. Hist., June, 1850, p. 26. 

 Brunchorst, A., Bergens Museums Aarsberetn, 1886, p. 219. 

 Fischer de Waldheim, A., Apercu systematique des Ustila- 

 ginees (1887). 



John son, T., Economic Proc. Roy. Dublin Soc., 1 , p. 45 3 ( 1 908). 

 Massee, Geo., Journ. Bd. Agric, p. 592, 1 pi. (1908). 



Fig. 160. Spumaria alba. The Plasmodium lias crept up the 

 ins of a grass, to mature its spores. Reduced. 



Sorospliaoa veroniccu (Schrot.) forms small, irregular, or 

 cylindrical outgrowths on the leaves of various species of 



