197 
Polycycly. 
protostelic (Fig. 60 A), strand, and the earliest leaf-trace is of exactly 
the same nature (E). Internal phloem arises before the second trace 
departs (B) and is formed in connexion with the adaxial phloem of 
the trace, as in the Lindsaya- type. The stele now increases greatly 
in diameter and isolated endodermal cells appear in the internal 
Fig. 60. Matonia pectinata. Series of diagrammatic transverse sections 
drawn to scale to show the increasing complexity of the stelar system in the 
ontogeny. 
The figures in the first column represent the internodal, those in the 
second column the nodal condition, while those in the third column represent 
transverse sections of the base of the leaf-trace. For further explanation see 
text. 
