Hé Bob, you got me there, yes Hackberry being a Elm related species does have the interlocking grain, very much like the other Elm species, and as you say the wood is much lighter in color, I have turned only a couple of Hackberry pieces, found the wood not attractive, seen pictures of spalted that did look much better.
The only Elm with a thin bark is the Lacebark Elm, AKA Chinese Elm, or branch and limbs of the other Elm, like Siberian Elm.
Ulmus, Lacebark Elm.jpg
So yes you certainly might be right, that it is Hackberry, it being an Elm related species, I don’t know the difference between the Hackberry that grows here or the Sugar Berry, not sure I ever seen it.
I have always thought that any wood is a good wood to turn, at least to find what it looks like and how it stands up, one can haul there noses up to native grown wood, and have to turn imported tropical wood, I don’t think tropical forest have to be destroyed so we can make silly sticks etc from it, just the way I look at that.