Slide 22: Cross section of a eudicot stem showing a vascular bundle. The xylem (some of which is stained red) is at the bottom of the bundle. The phloem lies above the xylem, with a layer of vascular cambium in between. Note the thick-walled sclerenchyma fibers (stained bright red) in the phloem. (For reference, see Fig. 35.16, p. 724.)