﻿FIG. 
  216. 
  Sensitive 
  fern, 
  or 
  oak 
  fern 
  (Onoclea 
  sensibilis) 
  

  

  r.s, 
  rootstock, 
  or 
  rhizome; 
  l.s, 
  leaf 
  bases 
  of 
  former 
  years; 
  f.l, 
  foliage 
  leaf; 
  s.l, 
  

   sporangium-bearing 
  leaf. 
  One 
  fourth 
  natural 
  size 
  

  

  277 
  

  

  