Vascular System of P ter is. 
i r 
Figs. 14 — 25. Pteris aquilina. Selected sections from a transverse series 
through node (see Fig. 13). Figs. 18—24 shewing also transverse 
section through base of petiole, thus exhibiting connexions of vascular 
strands of petiole with those of rhizome. Lateral folds of petiolar 
sj r stem (A, B) and inner strands of rhizome, black ; outer strands, white; 
sclerenchyma, diagonally lined. 
The strands represented in black in these figures are those which 
