RUST, SMUT, ETC. 



(1) 



113 



FIG. I. BOTRTTIS INFESTAXS. 



(1) Head, or spores of the fungus. (2) Mycluim, or spawn. (3) Cuticle of leaf 

 of potatoe. (4) Cellular tissue. 



The figure shows the manner in which the mycelium or spawn 

 of the fungus ramifies through the cellular tissue of the leaf. 



(1) UEEDO BUBIGO (Common Rust.) 



200. The minute vegetable organisms called fungi, are cellular 

 plants having neither leaves, stems nor roots. Their organs of 

 nutrition consist of a series of filaments called the Mycelium 

 (fig. 1, 2), (mykeSj a fungus) or spawn, which spread like a net- 



