Multiple choice Which secondary covering(s) is/are found in the stem and leaves in dicots? Epidermis Phellogen Phelloderm Both (2) and (3) Reveal answer Fill a bubble to check yourself D Correct answer Explanation Periderm covers the stem and leaves in dicots. Both phellogen and phelloderm are constituents of periderm. In other words, both phellogen and phelloderm form the secondary cover on the stem and leaves in dicots.