Help identifying tree

I just love this tree and saw a very large one at Grants farm that was tremendous. The branches have a very graceful weeping habit and the older one exhibitied more separation accentuating the beauty of it all. I am considering taking down a wild cherry right next to it; hate to because they are so bird beneficial but I think this deserves the complete space. Can anyone help me with more information on this tree?

 

Celtis sp. (Hackberry)

 

Overall the growth pattern and fruit pattern matches but my leaf has a nodules of some type. Is this just a different strain of hackberry than what I am seeing pictured?

 

The hanging balls are fruits, the blemishes on the leaves a health problem.

 

Look like Eriophyid mite galls; not a serious problem, no treatment needed.

 

That is interesting because the large tree at Grant's Farm has the same exact growths...this is what it is http://www.entomology.umn.edu/cues/Web/144HackberryNipple.pdf