Fig. 13.— Highly-magnified transverse section of wood of oak, showing three of the large pitted vessels (Gef) and a number of smaller ones. M.Str, medullary rays, of which part of a large one is shown to the left; Librf, wood-fibers; H.P., wood-parenchyma; Trach, tracheids; J.Gr, boundary of annual ring. (Kny.)
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THE SEEDLING AND YOUNG PLANT