Resin canals are elongated, tube-shaped intercellular spaces surrounded by epithelial cells that secrete resin into the canal. They exist in the wood of the genera Picea, Larix, Pinus, Pseudotsuga and Shorea. ==Further readings== ...
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http://en.wikipedia.org/wiki/Resin_canal
(from the article `wood`) A transverse section of trunk also shows linear features called rays radiating from pith to bark and ranging in width from very distinct, as in oak, ...
Found on
http://www.britannica.com/eb/a-z/r/36
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