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residual procambiumparenchyma
primary xylemprimary phloem
Cells begindividing
Vascularcambium
forms
Secondaryxylem and
phloemform
secondary xylem
secondaryphloem
vascular cambium
secondary xylemsecondary phloem
vascularbundle
residualprocambiumvascularbundle
primary xylemparenchyma
primaryphloem
interfascicularcambiumfascicularcambium
vascular cambium
secondary phloem
secondary xylem
secondary xylem
secondary phloem
vascular cambium
cortex
cortex --> phellodermcork cambium
phellem
As the stem enlarges, theepidermis is broken, and must be renewed (asphellem/cork.