XXIV] ANATOMY i97 



tinuous outwards into the petiolar trace. The xylem, which is sometimes 

 fluted {G. circinatd), is surrounded by a relatively narrow band of phloem, 

 with a broad band of pericycle, and a continuous endodermis delimits the 



Fig- 477- Transverse section of the protostele in the 

 rhizome of Gleichenia Jlabellata R. Br., from a section 

 by Gwynne-Vaughan, showing a leaf-trace being given 

 off. (X30.) 



Fig. 478. Transverse sections of the rhizome of Gleichenia 

 Jiabellata, showing the detachment of the leaf-trace from 

 the protostele, with its included protoxylems. (After 

 Tansley.) 



Stele (Fi^. 478). The vascular supply to the roots is thrown off superficially, 

 and mostly from the lower side of the stele. The leaf-trace, which is a 

 deeply in-rolled horse-shoe, with 3 protoxylems subsequently increased to 



