LIFE HISTORY OF A FERN 



149 



FIG. 107. Portion of the rhizome of the common brake (Pteris aquilina) 

 showing a cross-section view at the right. The two dark areas are scler- 

 enchyma. 



FIG. 108. Cross-section of the rhizome of the bracken fern (Pteris aqui- 

 lina), showing the tissue systems. Greatly magnified. 



