[IAWA Forum] ? inclusions in ray cells

From: ALaure Decombeix <anne-laure.decombeix@cirad.fr>
Subject: [IAWA Forum] ? inclusions in ray cells
Date: Fri, 09 Jun 2006 09:21:11 +0200

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Dear all,
I am a French PhD student in paleobotany. I am currently studying
Carboniferous woods and I have encontered strange dark inclusions in the
ray cells of some of them.
These inclusions are of variable shape, often circular but sometimes
elongated or square. Their size is around 30µm. The remarkable thing is
that they are surrounded by a clear zone bounded by a thin layer. (I can 
send some photos).
I have found a reference of the same type of inclusion occurring in a
Devonian wood (Stubblefield et al., 1985) but the authors didn’t
elucidate their true nature. They ruled out fungi spores because of the
various shapes and sizes. Could it be crystal? or resin (there's no
resin canal in the rays of these woods)?
Is it something that occurs in extant woods? Do you have some references
on this or know somebody who may help me?
Thank you  in advance for your answers,
ALaure

Anne-Laure Decombeix
UMR "botAnique et bioinforMatique de l'Architecture des Plantes" (AMAP)
TA40/PS2, Boulevard de la Lironde
34398 MONTPELLIER CEDEX 5 FRANCE
tel:04-67-61-75-52
fax:04-67-61-56-68
http://www.amap.cirad.fr
anne-laure.decombeix@cirad.fr

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