ROOTS. 



97 



FIG. 92. A tropical aroid (Anthuriurri), showing its large leaves, and bunches of 



aerial roots. 



soil they usually do not penetrate or enter into any soil re- 

 lation. Such pure water roots may be found dangling from 

 the under surface of the common duck weeds, which often 

 cover the surface of stagnant water with their minute, 

 green, disk-like bodies. 



