146 DISEASES OF FIELD & GARDEN CROPS. [OH.XXII. 



contrary, will produce Uredo Rubigo-vera, D.C., if placed 

 on the leaves of various grasses and cereals. Professor 

 de Bary states, Neue Untersuchungen uber Uredineen, ii. 

 1866, that the germ tubes of the ^Ecidium spore, on 

 germination, bore into the cuticular cells of certain grasses, 

 and develop a mycelium in the body of the leaf, which 

 mycelium at length gives rise, after about eight days, to 

 Uredo Rubigo-vera, D.C. 



JEcidium asperifolii, Pers., has been found in Europe 

 on Gynoglossum officinale, L. ; Borrago officinalis, Tour. ; 

 Anchusa officinalis, L. ; A. arvensis, Bieb. ; Nonnea pulla, 

 D.C. ; Symphijtum officinale, L. ; S. tuberosum, L. ; Cerinthe 

 minor, L. ; (7. alpina, Kit. ; Echium vulgare, L. ; Pulmon- 

 aria officinalis, L. ; P. tuberosa, Schrk. ; and Lithospermum 

 arvense, L. 



