——_ ==. 
CBPRadnat.del. fr 
Fic 1.—vUREDO LINEABRIS. 
a, cluster of Uredo-spores springing from mycelium in a Wheat-plant surrounded by the ruptured 
epidermis; 4, c, d, ¢,f, Z, 4, t, Uredo-spores of various ages; &, Uredo-spore germinating 
in water,—the first change ; Z, m, 7, further stages of germination in water as explained in 
the text; 0, Three spores of Uredo germinating upon the cuticle of Wheat, the germ-tubes 
of which are entering the stomata, 8—1o hrs. ; , Germ-tube from a Uredo-spore squeezing 
itself into a stomate (7 hrs.). 
From an electrotype supplied by “ The Gardeners’ Chronicle 7 
