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This is different from the dark brown and reddish-brown layers found in the bark of red elm or slippery elm. The American elm features an open, spreading crown and drooping limbs that form a vase ...
However, almost all mature American elm trees have been killed in the last 50 years by Dutch elm disease, which is caused by a fungus, Ophiostoma novo-ulmi, introduced from Asia. Elm bark beetles ...
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