Image Source - TREES, ASSOCIATES, and SHIGO (2 CD set).

Bark, Outer (periderm)  - Outer bark or periderm is mostly dead cells lined with a fatty substance called suberin or cork.  Cork resists breakdown by microorganisms.  Outer bark is the protective covering of trees with symplast.
(See TREE ANATOMY, SHIGO and SHIGO 2002)

(Click here for info from SHIGO, 2002 on Bark)  
Image Source - TREES, ASSOCIATES, and SHIGO (2 CD set).
See "Outer Bark."

Picture - Cross Section

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