



FIG. 109. Gr, forking central cylinder of Osmunda cinnamomea; H, central cylinder of 

 same ; /, same, showing presence of internal phloem ; J, part of central cylinder 

 shown in 7, more highly magnified; K, mesarch bundle of same; Z, stem of Hete- 

 rangium Grievii, after SCOTT; x 5 : ar, central mass of primary wood; ,r 2 , secondary 

 wood ; ic, inner cortex ; It, leaf trace ; r, adventitious root ; oc, outer cortex ; -pet, 

 petiole. 



