A few years ago there was a conversation on this site about a large shaggy bark maple in central Maine that no one seemed to be able to identify. I'm in southern Maine and have come across several large, old (at least 100 years old) 3-lobed maples that I can't identify. The leaves look a bit like mountain maple but since that's a shrubby plant, that doesn't work. Here are a couple of pictures. Any suggestions are greatly appreciated!