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THE OAK.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/f/fa/The_Oak_%28Marshall_Ward%29_Fig_14.jpg/400px-The_Oak_%28Marshall_Ward%29_Fig_14.jpg)
Fig. 14.—Radial longitudinal section of wood of oak (highly magnified). M.Str, medullary rays; Trach, tracheids; Gef (to the left), smaller pitted vessels; Librf, wood-fibers; H.P., wood-parenchyma. The large mass of tracheids to the left of the center of the figure lies over one of the broad pitted vessels. J.Gr, boundary of annual ring. (Kny.)