532 



DISEASES OF CULTIVATED PLANTS 



cultivated plant than potatoes, alternation of crops is 

 suggested. 



Berkeley, M. }.,Journ. 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., Aper$u systematique des Ustila- 

 ginees (1887). 



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

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



FIG. 160. Spumaria alba. The plasmodium has crept up the 

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



Sorosphaera veronicae (Schrot.) forms small, irregular, or 

 cylindrical outgrowths on the leaves of various species of 



