684 
Kershaw.—A Fossil Solenostelic Fern. 
Sections a , b , and c are below the node, and the stele is here a complete 
ring. In section d the stele has opened, forming the leaf-gap. Sections 
e and f, in addition to the leaf-gap, show a swelling of the stele on one side, 
which indicates the developing lateral branch (b). In g the branch has 
separated from the main stele, in which the leaf-gap is still open. The two 
Text-fig. A series of transverse sections through an intemode and part of a node of S. japonica. 
Description in text. 
remaining sections are merely of the lateral branch, the main stele having 
disappeared. 
It seems probable that the rhizome was a dorsiventral one, the leaf-gap 
being on the upper surface, while the roots arose from the under surface of 
the rhizome both at the nodes and internodes. 
