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Bumps on trunks

doug jensen doug_jensen at SMTPGTWY.BEREA.EDU
Mon Sep 30 12:46:07 EST 1996

This sounds like a good explanation to me.  If tree has grown much since a 
branch broke off, the cork cambium eventually envelopes it and creates a bump.  
With time (30 years??), I would expect the bump to become less apparent.  If you 
want to be sure, you could check a fallen tree for a knot in the wood behind the 
Technically, I wouldn't call this wound tissue, because, although the formation 
is the result of a wound, the tissue which formed it is the result of normal 
growth.  There may be some wound tissue present, but it probably is not 

--Now, perhaps someone can put me straight.....

Doug Jensen
Subject: Bumps on trunks
From:    Gunnar.Fridborg at fysbot.uu.se (Gunnar Fridborg) at Berlink
Date:    9/30/96  8:31 AM

Hi tree lovers!

Big bumps on the lower parts of  trunks are  frequent in some aereas, for
instance on oaks. To my students I use to say that such a bump consists of
wound tissue developed where a  branch was broken or sawed. Nor I or my
student are fully satisfied with that explanation but I have no other. Have


Gunnar Fridborg
Associate Prof, Lecturer, Director      Docent, Univ lektor, Studierektor
of Education
Department of Physiological Botany      Inst for fysiologisk botanik
Uppsala University                      Uppsala universitet
Villav=E6gen 6  S 752 36 Uppsala Sweden   Villav=E6gen 6  752 36 Uppsala
Phone +46 18 182820                     Tel 018 182820
=46ax   +46 18 559885                     Fax 018 559885
E-mail  Gunnar.Fridborg at fysbot.uu.se

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