Mature Tree Bark  -  Mature bark (phellem - outer bark) is the corky outer bark that forms on, or as, a tree of most species matures.  It is primarily made up of suberin.  Layers of green cortex-like tissues often form in fissures on old trees that have thick bark. 
(Click here for info from SHIGO, 2002 on Bark)
 
See "Bark". 
See "Inner Bark". 
See "Outer Bark". 
See "Cork". 
See "Fissures".

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