. Bulletin (Pennsylvania Department of Forestry), no. 11. Forests and forestry. 140 BUR OAK Quercus macrocarpa, Michaiix FOEM—Usually attains height of about 70 80 feet but may reach a maximum height of 170 feet with a diameter of 6-7 feet. It attains its greatest height In Illinois and Indiana. It has broad spreading branches which form a broad round-topped crown. In the forest the crown is usuaUy contracted and covers only the upper part of the trunk. It is a giant among its associ- ates. One of the largest Bur Oaks in Pennsylvania is shown in Fig. 51. BARK—Intermediate between flaky bark of
. Bulletin (Pennsylvania Department of Forestry), no. 11. Forests and forestry. 140 BUR OAK Quercus macrocarpa, Michaiix FOEM—Usually attains height of about 70 80 feet but may reach a maximum height of 170 feet with a diameter of 6-7 feet. It attains its greatest height In Illinois and Indiana. It has broad spreading branches which form a broad round-topped crown. In the forest the crown is usuaUy contracted and covers only the upper part of the trunk. It is a giant among its associ- ates. One of the largest Bur Oaks in Pennsylvania is shown in Fig. 51. BARK—Intermediate between flaky bark of White Oak and very roughly ridged bark o£ Chestnut Oak. TWIGS—Stout, covered with pale, raised and inconspicuous lenticels, yellowish-brown, at first hairy, later snaooth, with corky wings often IJ inches wide. BTJDS-Altemate. broadly-ovate, about i of an Inch long, acute or obtuse, reddish-brown, slightly pubescent. Lateral buds are closely appressed. LEAVES—Alternate, simple, 6-12 inches long, 3-6 inches wide, obovate or oblong; 5-7 lobed; sinuses round-based; terminal lobe largest; smooth, shiny, and dark green above; paler and finely hairy beneath. LEAF-SCABS—See "Leaf-Scars" under White Oak, page 138. FLOWERS—Mature about May. Staminate flowers borne In slender ament 4-6 inches long. Pistillate sessile or short-stalked, with bright red stigmas and hairy scales. FRUIT—An acorn, maturing during flrst season; sessile or stalked, usually solitary. Nut ovate 4/6-2 inches long, covered with down. Cup deep, embracing from i to entire nut, light brow^. downy on inner side, covered with large imbricated scales forming a distinct fringe near the margin. WOOD—Ring-porous; with conspicuous medullary rays; heavy, hard, strong, close-grained, very durable, brownish with light thin sapwood. Weighs 46 lbs. per cubic foot. Used for the same purposes as White Oak, from which It Is not distinguished on the market. DISTINOUISHING CHARACTERISTICS—In summer the Bur
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