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American Foresters attacks Auxins Black locust branches cells chlorophyll clearcutting cluster cones Conifer damage Department of Forestry Douglas fir Dutch elm disease Edges neither toothed estry flat Flowers forage forest community forest fires forest floor forest land forest management Forest Resources Fruit fuels fungus group selection growth gypsy moth habitat hardwoods improve inches long insects and diseases Intermediate cuttings kinds of trees layers leaf Leaflets Leaves simple lobes logging maple mature stand moisture Natural Resources needles nutrients nuts oval owner phloem photosynthesis planting seedlings plants and animals prescribed burning recreation reproduction cuttings rodents roots Sapwood School of Forestry seed-tree system seeds selection system shelterwood shrubs silvicultural system single-tree selection Society of American soil species of trees spherical sugar timber toothed nor notched tree species tree's trees grow trunk University watershed white pine wildfire wildlife habitat wildlife species wood yellow poplar