Pits  - Conifers have tracheids with pits.  Pits regulate flow of liquids. Pits are made up of a central torus and a webwork structure called the margo.  Bacterial erosion of the pits in spruce is the secret of Stradivarius violins.  Pit erosion, is the pits selectively digested, mostly in ponded logs.  For much more see SHIGO 2002 CD's "VIOLINS WOOD."

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