158 



in.ANT RTrniER 



tliG food wliioli they mamifacturt'. The less chlorophyll is 

 used the less is it developed, and a green plant which is 

 obtaining the larger amount of its food in a saprophytic 



or parasitic way is 

 on the way to losing 

 all of its chlorophyll 

 and becoming a com- 

 plete saprophyte or 

 parasite. 



Certain of the low- 

 er Algffi are in the 

 luibit of living in the 

 l)ody cavities of high- 

 er jilants, finding in 

 suidi situations the 

 moisture and protec- 

 tion which they need. 

 They may thus have 

 brought within their 

 reach some of the 

 organic products of 

 tlie liigher plant. If 

 tliey can use some of 

 these, as is very like- 

 ly, a partially para- 

 sitic haliit is begun, 

 wliicli may lead to 

 loss of chlorophvH 

 and complete para- 

 sitism. 



\'U. Symbionts, — 

 'V\]c ])hcn()nuMion of 

 symbiosis will be re- 

 ferred to nidi'e fully in cDinH'ctioii witli Lichens (S 104). 

 In its broa-dcst sense the wci'd inrludcw any sort of de]i(Mid- 

 ence between living organisms, fi-om the vine n,ii<l tlie tree 



, lis. 



Bi-ll.l; 



nf p: 



j\ llo.l.lrr pill 



!ltll■^s , I. Hi. In- tuhirsHh 111.^ v 



lilt HiickiriL^ prorcssis w I lie) I pn 



rl). — Arirr STIlAMItlMtOKIL 



