THE ANGIOSPERMAK : LH.WES y-i 



bundle or else folded together oppositely. The large leaves of the I'alms are 

 an exception, for they are often complexly pleated like a folded fan. In 

 Dicotyledons individual rolling or folding or pleating, or combinations of 

 these, are all known (Fig. 961). The mode of unfolding, when the bud begins 



I 



Fig. 961. — Oiiercus robur. Transverse section through a winter 

 bud surrounded by protecti\e scales and showing llie 

 pleated arrangement of the young foliage leaves within. 



Fig. 962. — Popuhis canduans. Vernation showing 

 rolled young foliage leaves and expanded bud scales 

 at the base. 



