Acer campestre - new material. I thought the tree was smaller when I saw it on a collection site...but, it turned out to be a very large stump. Trunk is hollow, but seems very healthy with good calousing over all wounds. Now, potted, looks like this tree has an inverted taper and that it's thinner approaching nebari but that's not true. Nebari is very good and wide...almost like a box in which it's planted. Now, covered with substrate, looks like tree has inverted taper problem.
The only problem regarding this tree is size. I thought I won't collect any more trees that are so big but, it seems ..it's not working.
At the end, I am very happy with this finding because I know that Acer campestre is not so easy to find in form of a good and interesting bonsai starter material. And this one is good.