Color is the same as my green slimer but the coralites and growth pattern are extremely different. Looks like more of a tableing acro, but I am not sure.
I have 2 one that grows more vertical and another that grows something similar to that one. I think they are probably the same species but a different variation of an Austera.
Does anyone know if the site that had pics of all the different species is back up somewere?
Growth patterns can be influenced by water flow patterns. I've seen acropora growing as a wall and as branches from the same base, depending on the strength of the current hitting it.
Hanin got that from me as a frag and it was described as a A. serrinidae at the time. It had a typical thin branch stag growth pattern with some interesting curves. Lost the colony a long time ago though. As Danny said its all about flow.