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
bumps.
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
considerable.
--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
you?
Thanks
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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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