Fig. 17.2-1. Transverse section of ivy (Hedera helix). In this micrograph, you can see the cuticle, and below it are complete epidermis cells, with cork cells below them. The cork cambium in this species forms in the cells just below the epidermis, but not in the epidermis itself. This is only the first cork cambium; if the stem lives long enough, more cork cambia will arise deeper in stem, perhaps in the cortex, later in the secondary phloem.