n6 



BOTANICAL GAZETTE 



[august 





me 



radial longitudinal sections of the large 



included foliar strand. A careful study of a series of such radial 



sections through the trace has made it apparent that this connection 



means of Ions, irregularly shaned scalariform 



mere 





Fig. 3. — Radial longitudinal section of portion of large medullary ray with 



included foliar strand: //, peculiar tracheidal formation apparently resulting 

 fusion of two or more tracheids; rt, irregularly reticulated elements; X90. 



from 



may 



be 



necting elements, as generally believed. These vessels 

 entirely scalariform in structure, or may change gradually from a 

 reticulate type at their tapering ends to decidedly scalariform 

 throughout the greater part of their horizontal and vertical extent. 

 As they extend horizontally through the gap they are arranged in 

 order of formation, one vessel beneath the other (figs. 4, 5). the 







