Stránka:book 1922.djvu/420

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The Book of Woodcraft Bur Oak, Cork Bark or Mossy Cup. {Quercus macrocarpa) A large forest tree, up to i6o feet high; known by its enormous acorns and the corky ridges on the twigs. The cork of commerce is the bark of an oak found in Spain and it's not surprising to find a cork bark in our own land. The leaves though greatly varied are alike in having two deep bays one on each side near the middle dividing the leaf nearly to the midrib so that the tj^ie is as given below; they are 4 to 8 inches long. The acorns ripen in one season. The wood is like that of most oaks, and lasts well next the ground. A cubic foot weighs 46 lbs.