Notes , 
^59 
this arc joins the unaltered part, placing the internal and external 
phloem in communication : the free end of the arc rapidly raises 
itself, at the same time rotating laterally outwards, while its internal 
phloem (derived from the phloem of the bay) closely follows it, so 
that a wide gap is formed in the stelar tissues; as the free end 
of the arc moves away from the stele the internal endodermis 
Transverse sections of stele of rhizome of Lindsaya orbiculata. The phloem 
is diagonally shaded, the xylem, pericycle and endodermis left blank. The 
outer limit of the endodermis is indicated by a dotted line. Fig. 9. Internode. 
Figs. 10-12. Detachment of leaf-trace. 
approaches the outer one, they touch and open, thus placing the 
internal strand of parenchyma, which has dilated considerably, in 
connexion with the cortex (Fig. n). Meanwhile the arc of xylem, 
with its internal and external phloem, raises itself further from the 
dorsal surface of the broken stele, deepens its concavity so as to take 
on a gutter-shaped form (Fig. 12), finally detaches itself from the 
