ROOTS. 



103 



tree trunks buttressed by such roots which extend out over 

 and beneath the surface, and divide the area about the tree 

 into a series of irregular chambers (see Fig. 100). Some- 



FIQ. 99. A screw-pine (Pandanus), from the Indian Ocean region, showing the 

 prominent prop roots put out near the base. 



times a stem, either inclined or with a poorly developed 

 primary root system, puts out prop roots which support 

 it, as in the screw-pine (see Fig. 99). A notable case is 

 8 



