-in most dicotyls and gymnosperm, secondary thickness growth also occurs in the root

-cambium forms between the xylem and phloem and party of the pericycle (above the xylem branches) become meristematic

-the further sequences resemble those in the secondary shoot

-secondary xylem and phloem form as in the shoot with wood and bast rays (Strahlen)

-pericycles form a periderm, all tissue outside of it are shed (abgeworfen) or torn apart