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Instructor: Dr. Elisabeth Wheeler


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.

Growth Rings: Earlywood/Latewood Longitudinal Tracheids
Resin Canals Ray Structure Cross Field Pits



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