Footbridge along North Country Trail, Forest County, Pennsylvania. The trees here are Eastern Hemlock (tsuga canadensis). The Pennsylvania state tree is frequently found near forest streams, providing shelter, firewood, and shade for the weary hiker. The Eastern Hemlock in Pennsylvania has not been affected, as yet, by the woolly adelgid insect pest that has tragically destroyed large tracts of Eastern Hemlock in the southern Appalachian mountains.