Overstory is the larger, taller trees of growth which occupies a forest area and shades young trees, hardwoods, brush, and other deciduous varieties which are growing beneath the larger trees (i.e., understory).
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... was a major component of eastern deciduous forests from Maine to Georgia and west to Illinois, in some places constituting more than 40% of overstory trees. Early in the twentieth century, chestnut blight, a nonindigenous fungal disease from Asia, broke out near New York City and quickly ...
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