OTHEE METHODS OF OBTAINING FOOD 217 



parasitism. They in- 

 clude such forms as 

 Lathr&a and Oro- 

 banche, which are 

 members of the 

 British Flora. La- 

 thrsea has already 

 been mentioned as a 

 plant which draws 

 proteid material from 

 small animals which 

 it captures and kills. 

 It supplements this 

 method of obtaining 

 food by becoming pa- 

 rasitic on the roots of 

 trees, to which its 

 roots attach them- 

 selves by suckers, 

 much in the same way 

 as the semi-parasites 

 already described. 

 The host plant in this 

 case is drawn upon 

 for carbohydrates as 

 well as proteids, as 

 Lathrsea possesses no 

 chlorophyll. 



Orobanche resem- 

 bles Lathraea in ex- 

 hibiting the same de- 

 gree of parasitism. 

 It shows certain differ- 

 ences of structure, 

 and it does not attach 

 itself exactly in the 

 same way. It derives 



FIG. 105. PLANT OF Melampyrum INFESTED 

 WITH Cuscuta. 



