THE ROOT. 71 



roots. In older roots these functions may be maintained 

 with the addition of mechanical tissues for strength and cork 

 tissues outside for protection. Other roots as they grow older 

 may be transformed into storage places, floats, tendrils, thorns, 

 etc. The branching of roots is usually monopodial. Branches 

 arise in longitudinal rows, originating internally near the 

 surface of the stele. Roo ts may produce adventitious buds 

 instead of root branches. 



