PARASITES 



359 



Rattle are, as in the Mistletoe, often pale-green, and those 

 of the Louseworts are red or reddish-green. 



A few flowering plants are entirely dependent on ' host '- 

 plants for food. Some of these, like the partial parasites 

 above mentioned, attach themselves by suckers to the 



Fig. 229. Toothwort. 



1, part of underground stem ; 



2, roots ; h.r, root of ' host '- 

 plant ; P.r, root of parasite ; 

 s, suckers attached to ' host ' ; 

 sc, scale leaves. 



Fig. 230. Twining Stem 

 of Dodder attached by 

 Suckers to the Stem of 

 Hop. 



Fig. 229 a. Section of Root 

 of Ling showing Mycorrhiza. 



roots of other plants, e. g. the Toothwort (Lathraea squa- 

 maria) and the Broomrapes (Orobanche). 



The Toothwort, frequently found in hedgerows and 

 woods, possesses many features in common with sapro- 

 phytes like the Bird's-nest Orchid and Coral-root, e. g. its 



