

8G 



MISSOURI BOTANICAL GARDEN 



due 



of 



many of 



but 



sm 



benefit from 



which it lives. However, the host nucleus offers a great re- 

 sistance, retaining its natural content and form for a long 

 time. Even in some very old infected cells the nucleus may 



found 



found 



m 



remains 



firm, being held in posit: 

 rigid walls of other cells. 



h 



base of a tubercle 



are found filled with the fungus. 



minute study 



that the mycelium is composed of dense granular protoplasm 



in w 



hich are imbedded man 



of considerable size 



After a 



(f. 34). No cross walls can be distinguished, 

 cell becomes partly filled with the mycelium, branches are 

 sent out radially toward the periphery of the cell, which at 

 first are narrow and oblong, but finally swell at the ends 

 forming club or wedge shaped structures as seen in a median 

 section (f. 35, 36). The largest ones are 3.5 to 4//, across 

 at the widest part and usually 7 to 10/* long. For a consid- 

 erable distance back from the apex the vesicles and hyphao 



asm 



gradually 



found a few nuclei, while in older stages the h 

 vesicles are empty. Thus the fungus dies out 

 death being due to lack of food material after this has all 



been absorbed. 



The question arises whether the plant, in an indirect way, 

 derives a benefit from having the fungus living in its tissues. 

 From all appearances no specific injury can be 



It 

 asm 



manner that it can b 



from the fungu 



may be comparable to those which Hiltner 



finds in Loliwm temulentum, where the fungu 

 roe>. nitrogen of the air which in turn is take 



the plant. The position which the 



^ ' 



the 





