RELATIONS OF ANTS TO I'ASCULAR PLANTS. 



297 



are often hollowed out and inhabited by ants (Heim), and the curious 

 ascidiaof Dischidiarafflesiana are similarly utilized. In North America 

 various species of ants inhabit the old, dry pitchers of Sarracenia. In 



FIG. 168. Stem and leaf of Endospcrmnm fonnicaniiu, the former inhabited by 

 colonies of Camponotus quadriceps, (Dahl.) Two nest openings are seen in upper 

 part of stem. Where the petiole joins the leaf there are two nectaries. 



South America several genera of plants (Tococa, Majeta, Microph\s- 

 cia, Calopliyscia, Mynncdonc, Hirtclla} have bladder-like dilatations of 



