If it does not shed it's leaves in Winter it is not an Elm.
It depends on which species of elm you are talking about. Elms belong to the genus Ulmus. The American elm is Ulmus americana.
Elm grows everywhere in the Iroquois country - northern Pennsylvania and throughout New York state. It was widely used instead of birch bark for canoes, longhouses and even containers.
Elm bark was gathered by men in spring or early summer; a vertical knife cut was made and the bark could be peeled off the tree in very large sheets. Often the entire tree would be cut down so that all its bark could be harvested. Fresh bark was always used whenever possible, since it tended to become brittle if stored for any length of time; if kept damp or in a shady spot it remains flexible for a long time.
When used for making canoes, the inner smooth surface of the bark became the outside of the canoe.
When used as roofing material the rough outer surface of the bark was laid facing outwards and tools were used to flatten out much of the roughness.
The Slippery Elm, Latin name Ulmus rubra, is a species of tree that is indigenous to eastern North America, from Florida out west to Texas and then north to southern Quebec. The Slippery Elm is also known as the Red Elm and Gray Elm.
Pull in the layby next to Hagley Wood heading west. There is only one. Walk along the pathway, still west, until the wood meets the fields. Enter the wood, there is a gap. Follow hedge upwards to the first fire break. Turn left, walk 200', turn right and re-enter the wood. Keep climbing until the wood thickens, look for a large Holly tree, too the right see an elm...
Grow 50-60 ft (15-18 m) in height, exterior bark is rough, dark brown, inner white bark is mucilaginous. Flowers bloom in dense clusters with bright red stigmas developing into flat round paper-thin fruits.