. Bulletin (Pennsylvania Department of Forestry), no. 11. Forests and forestry. 118 l!i !li«! BLACK BIRCH. Betula lenta^ Linnaeus. FORM—This tree usually attains a height of 50-60 ft. with a diameter of 1-3 ft., but may leach a height of 80 ft. with a diametei of 5 feet. Trunli rather continuous, sometimes subdivided, bearing long, slender, lateral branches which are ascending on young trees forming a narrow conical crown, or often pendulous on old specimens forming a wide spreading crown. BABK—On old trunks (Fig. 71) distinctly black, broken into large, thick, irregular plates which are smoot
. Bulletin (Pennsylvania Department of Forestry), no. 11. Forests and forestry. 118 l!i !li«! BLACK BIRCH. Betula lenta^ Linnaeus. FORM—This tree usually attains a height of 50-60 ft. with a diameter of 1-3 ft., but may leach a height of 80 ft. with a diametei of 5 feet. Trunli rather continuous, sometimes subdivided, bearing long, slender, lateral branches which are ascending on young trees forming a narrow conical crown, or often pendulous on old specimens forming a wide spreading crown. BABK—On old trunks (Fig. 71) distinctly black, broken into large, thick, irregular plates which are smooth on the surface; on younger parts of the trees (Fig. 70) smooth, shining, very close fitting, reddish-brown, with sweet wintergreen taste and covered with horizontally- elongated lenticels. TWIGS—During the first summer light green and hairy, later becoming reddish-brown, smooth, shining, with pronounced wintergreen-like flavor. Terminal twigs slender and elongated, while lateral spurs are numerous, stout, and short. BUDS—Alternate, about i of an inch long, conical, sharp-pointed, shining, covered with reddish-brown overlapping scales with downy margins. Three bud-scales usually visible on buds of terminal shoot and fiom 5-8 on lateral spur shoots. LEAVES—Alternate, simple, ovate, usually heart-shaped at base, serrate on magrin, long- pointed at apex, dark green above, pale green below, 25-5 inches long, li-3 inches wide. LEAF-SCARS—Alternate, small, semi-oval in outline, containing 3 rather small, equidistant bundle-scars. FLOWERS—Appear about April before the leaves. Staminate formed in fall, remaining over winter as aments about 3 of an inch long, in clusters of usually three, which elongate to about 3 or 4 inches the following spring. Pistillate about A-3 of an inch long, slender, and pale green. FRUIT—A strobile about lS-2 inches long, sessile, smooth, erect, with smooth 3-lobed scales and small winged nutlets. Lobes of the scales are about equal in lengt
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