Treestreams have been recently rolled out to the hosted Oneslate instances. Treestreams include all rooted trees, ranked by most recently expanded, and they disclude singleton (unlinked) nodes. So, if tree is linked to multiple parent nodes, the transcluded tree is displayed in the tree stream included with each rooted tree.
Tooltips indicate the title of the root node for each tree in the treestream on hover. Play with treestreams at the demo site or create content at the public instance if you are so inclined. Obligatory screenshots follow: