Poison ivy... treeeeee

I was in the back just cutting a few vines so that they will go brown and dry and I can stomp them in a few weeks... saw a few poison ivy leaves, avoided them (Walter at the beach showed me the blisters on his hands this morning, now I know exactly what it can do)... and then noticed a couple of intertwined trees. One of the twining trees was the marsh elm. One of them was poison ivy, and it's trunk was as thick as the real tree. It just had little roots growing out of it. All the way up. Yuck. It doesn't give me blisters, it just gives me the creeps.