360 



A TEXTBOOK OF THEORETICAL BOTANY 



Fig. 347. — Roots of Tiijoliuiii rcpeiis showing nodules 

 produced by Rhizobium tiifolii. 



Fig. 348. — Section through part of a bacterial 

 nodule on a root of Melilotus albus showing 

 peripheral masses of bacteria in the tissue 

 cells and enlarged cell nuclei. 



