Looks like dinos to me from those pictures. You can really get a good idea if you look up close. Reefcleaners has a good shot of it in their algae ID guide: http://www.reefcleaners.org/nuisance-algae-id-guide does it look like that?
BTW, don't use their suggested solution of boiling your rock, that's really dangerous and can kill you.
Looks like Dino's to me too. I remember reading a thread where someone cured their dinos with a low dose of peroxide, and by dipping the rocks in peroxide and scrubbing the dinos off.
Well this is a bit late, but I was browsing through old comments and saw this. For anyone's info who happens on this, the blackout and PH shock worked. It took a while for the tank to stabilize, but the dinos finally went away.
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