Bark  - Growing trees, trees with symplast, have two basic types of bark.  Bark is made up of an outer periderm and an inner phloem.  This is above as well as below ground.  Bark keeps moisture and gases in and resists attack by insects and microorganisms.  Trees have many bark diseases that are poorly understood.  Think how many communities of life live on and in tree bark.
Image Source - TREES, ASSOCIATES, and SHIGO (2 CD set).
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See Bark, inner (phloem) and Bark, outer (periderm)  

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