Porcelain Berry (Ampelopsis brevipedunculata)
Porcelain Berry is easy to spot in the fall with it's blue and purple berries.
Gardeners valued them for their beauty, but the plants quickly invaded parklands.
This is the vine that covers trees and shrubs like a hairnet, often in combination with bittersweet.
The last picture shows two small trees. The one on the right has been trimmed for two years. The one on the left has been overcome by porcelin berry.
(photo credit - "Thatcher Drew - 501square.com"). Photos with no people in them are available for use with credit under creative commons license