PARASITIC PLANTS. 179 



appearance, by the walls of the epidermal cells 

 arching outward. By the help of these papillae, 

 and especially by means of a juice which they 

 secrete, the suckers fasten themselves to their 

 support. If the suckers have attached themselves 

 to a dead body they flatten themselves out upon it, 



FIG. 44. CROSS SECTION OF CUSCUTA, PARASITIC ON THE HOP. 

 (" Pflanzenleben.") 



and make a kind of disk, which undergoes no fur- 

 ther development and serves only as an organ of 

 attachment; but if the prop is a living plant, a 

 bundle of cells presses forth from the middle of the 

 sucker, and presses into the living tissue of the 

 assailed plant (Fig. 44). This entrance is effected 

 with great violence. The bundle of cells breaks 

 through the firmly united cells of the epidermis 



