Growth Conifers exhibit Secondary Growth . This is the first instance of this that we have encountered. Secondary Growth is that produced by Lateral Meristems . The Vascular Cambium extends the meristematic activity of the Procambium . Procambium originates from the Apical Mersitems of the Shoot and Root .
Cambial activity spreads around the stem and unites the individual cambia of each bundle .
This produces a ring of meristematic tissue which produces cells towards the outside and the inside . Cells displaced to the inside form Secondary Xylem . Cells displaced towards the outside form Secondary Phloem. This converts a Eustele into an Ectophloic Siphonostele . We will study the process of secondary growth formation in the next lab.