Trunk Collar  - Trunk Collars and Branch Collars form at the base of branches where they meet with the trunk.                                               
SOME MYTHS ON COLLARS from (SHIGO, 1993).  [Myth 22. THERE ARE NO SUCH THINGS AS BRANCH AND TRUNK COLLARS.]  Branch collars and trunk collars are shown below in paper birch.  The collars are collectively called branch collars.  Anyone who has split wood has seen thousands of the collars, yet some people say they do not exist.  Some people have seen the pull-apart diagram of the collars and thought that that is the way they are in the living tree.  Not so!  In the tree the collars join and overlap as shown here.

See "Branch Collar."

(See SHIGO, 1991 pages 86-90)

(See SHIGO, 2002 for top quality images)

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