Dryer and rockier uplands and ridges are occupied by <answer>oak</answer>-chestnut type forests dominated by a variety of <answer>oak</answer>s (Quercus spp.), hickories (Carya spp.) and, in the past, by the American chestnut (Castanea dentata). The American chestnut was virtually eliminated as a canopy species by the introduced fungal chestnut blight (Cryphonectaria parasitica), but lives on as sapling-sized sprouts that originate from roots, which are not killed by the fungus. In present-day forest canopies chestnut has been largely replaced by <answer>oak</answer>s.
What trees are typically found in the dryer portions?
oak