ON THE DISEASES OF PLANTS. 43 
6 7 
(8) Red Rust of Corn (Puccinia graminis, Persoon), found on all grasses, 
but never on other plants or trees. The seed-vessel with two cells, the upper the 
shortest, on a thread-shaped foot-stalk. Yellowish-black or brown. 
« A piece of wheat-straw with the fungus growing upon it. b The same magnified. 
c A small portion of the straw magnified, d A transverse section of a portion of the sheath of the 
stem highly magnified, e An upright section of the straw highly magnified. 
