82 



BOTANICAL MAGAZINE. 



[Vol. XVII. 



Seedling gives out at first a filamentous radicle ; its end swells up to 

 a tubercle, when it has attained to the host-root. The front of the 

 tubercle penetrates int ) the cortex of the host, becomes, as it were, organi- 

 cally connected with the latter, and then difi'erentiates itself into di primary 

 haustorium (Fig. 15), while on its upper end the growing point of the' stem 

 comes to appearance (Fig. .5, 6s). At the same time numerous processes 

 ■which grow into roots appear on the side of the tubercle (Fig. 5-8). Both 

 stem and root are endogenoiis in their origin. 



The root is exceedingly brittle and destitute of root-hairs and root-cap. 



4. The long branches of the root show at frequent intervals irregular 

 tuberous swellings, wherever they happen to come in contact with a host 

 root (Fig. 4, 11-13). These tubercles have the same structure with the 

 similar organ of Christisonia subacaulis, Gardn., and also, they seem to 



