FIB RO VASCULAR TISSUES: PHLOEM 



119 



which are in turn followed by bast fibers. The rays of the phloem 

 in the basswood and other dicotyledons show no special feature of 

 interest, since they do not in any case manifest the intimate rela- 

 tion to the sieve tubes described above in the pine. 



FIG. 91. Radial section of the xylem, cambium, and phloem of the linden, of 

 basswood. Explanation in the text. 



In the next illustration (Fig. 91) the radial aspect of the phloem 

 in Tilia is shown. Here the rays appear naturally in longitudinal 

 section and are composed of heavily pitted cells containing dense 

 protoplasm and much starch. Above the ray are represented the 

 various elements of the hard and soft bast. On the extreme left 



