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A TEXTBOOK OF THEORETICAL BOTANY 



Leaf trace 



Fig. 567. — Gleichenia flabellata. Transverse section 

 of stem showing leaf trace leaving protostele in 

 which parenchyma cells are mixed with the 

 tracheids. 



Fig. 568. — Thatnnopteris schlechtendalii. Trans- 

 verse section of stem showing medullated 

 protostele. 



