Chris,
the A. brueggemanni is the staghorn, which it strongly resembles. There are a few closely related Acros of this massive, rough type that can only be truly seperated via a skeletal sample.
The table is more massive than I thought in the first foto. I would say it belongs to A. divaricata, which has radials that start as immersed and develope to appressed-tubular along the branches. A. solitariensis can take on this open branching, but has more scale-like radials.
Hope this helps.