Is the cambium layer made up of distinct, parallel vertical
lines, or is it
all one pool of fluid/nutrients, 360 degrees around the trunk?

The cambium is a thin layer of active cells that lies just under
the bark and just above the "wood."

The upper (outside) part of the cambium makes new bark. The
lower (inner) makes new wood.

Jim Lewis - - Tallahassee, FL - The phrase
'sustainable growth' is an oxymoron. - Stephen Viederman

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