Phellogen  - The phellogen, also known as the bark cambium, is the outer most part of the symplast.  "Phello" meaning "phellem", and "gen" meaning generate.  I generate.  I generate the outer bark, the phellem.  The phellogen ruptures and as it ruptures you get plates.  So then when the phellogen ruptures than you get a plate.  Some trees form plates in two directions and some only in one.  The trees that only form plates in one direction are the trees that as they mature, they form fissures. Click here for some illustrations. 

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