CELL-CONTENTS AND FORMS OF CELLS. 263 



ference probably takes place mainly through the cortical and 

 medullary parenchyma, (d) Spongy parenchyma, or loose, 

 spongy tissue with large intercellular spaces. The cells of this 



Fxo. X33. A cell from.sassafras pith sho^ng^mterceim^^^ 



itercellular space (i); 



being slighHy oblique, 

 view is transverse to the 



tS^^<^ ffarSf rpe%^aro??hliSl STr atS .owe. pa« (b). 



type vary from slightly branched cells, as in the mesophyll of 

 leaves to those which are strongly branched and stellate, as in 

 Juncus, Pondederia, and the stems of various marsh plants. In 



