Fig.
8.2-5. Transverse section of vascular bundle in stem of
cosmos (Cosmos). The next few micrographs will be high magnifications of
sieve tube members, and this medium power view is meant to help you get
oriented. The companion cells are easy to identify, being very small and with
dark red-stained contents (just a few of the many are indicated by arrows). The
sieve tube members are most of the other cells in the phloem (all the tissue
between the “Cambium” and the “Phloem fiber cap”).