SOFTWOOD ANATOMY: RESIN CANALS
Pines, spruces, larches, and Douglas Fir have "tubes" lined by
epithelial cells that produce resin.
Resin canals are oriented longitudinally and also in a few rays.
Normal longitudinal resin canals are usually
in the latewood. Resin canals are tubes lined with epithelial cells (thin-walled
parenchymatous cells); epithelial cells secrete resin into the canal.
After a tree is wounded, usually more resin canals than is usual are formed.
In some trees, the wood formed immediately after wounding will contain traumatic resin canals. Wounding may be
caused by freezing, fires, or mechanical damage. Traumatic resin canals do not
have as regular a shape as the normal resin canals, and are formed by some species
that normally do not have resin canals.
The page was last modified on Thursday, 03-Sep-2015 17:19:15 EDT