522 



A TEXTBOOK OF THEORETICAL BOTANY 



pointing inwards. The parenchymatous intervals between these strands 

 are leaf gaps, but the arrangement is not truly dictyostelic, because there is a 



Stele 



Petiole 



Root trace 



„.-*.*»-*•" 



Fig. 518. — Osmunda regalis. Transverse section of entire 

 stem showing central stele with pith, leaf traces and 

 at the periphery, separated leaf bases. 



ir^- 



-.J - «» A' *»»-'"-> "A, "~T — ■''■"■ " X ** 



Lee?/" trace 



-Mm Xylem 



Phloem 





-' " ■ ' . -s^ .^ i. ...; Pi 



Y !;>■*? 



lvJ:^'v3 



P/t/i 



Fig. 519. — Osmunda regalis. Enlarged view of stele 

 in Fig. 518 showing the separation of the leaf 

 traces from the stele. 



common endodermis surrounding the entire ring, and the strands are there- 

 fore not meristeles but only portions of a broken ring (Figs. 518 and 519). 



