122 



THE ANATOMY OF WOODY PLANTS 



as well as the functional plates being almost exclusively limited 

 to the terminal walls. Abortive and lateral sieve plates in the 

 angiosperms are known as lattices. In woody dicotyledons the 

 lattices are, in the case of lower types, often well developed and 

 are likewise frequently functional as actual sieve plates. Farther 



FIG. 93. Transverse section of the phloem in the grapevine. Explanation in 

 the text. 



to the right the figure shows more parenchyma and additional 

 fibers of the hard bast. 



For comparison with the basswood is presented in Fig. 93 the 

 transverse view of the phloem in the grapevine (Vitis species). 

 To the right lies a large ray of the compound type. To the left 

 of this is situated the phloem proper, consisting, as is often the 

 case in the dicotyledons, of hard and soft bast. The former tissue is 

 composed of fibers which differ chiefly from the corresponding 

 structures in Tilia by the fact that they are septate when viewed in 



