Lichen-Like Stuff on Live Rock?

brittant

Dog Person in the Water
Today, I was looking in my tank when I saw this light green stuff (kind of like lichen) on the surface of my live rock (which already has green coraline). I'm pretty sure this is a new development in the last week. I'll post a picture when my camera batteries are done charging, but any idea of what it might be?

Thanks guys for all of your help! You're all quite wonderful. :)
 
2 things come to mind when you say it looks like lichen.Number one being Bryopsis,which is a royal pain to get rid of.
And Number two is hair algae.It's also a pain,but nothing like Bryopsis.

But lets see the pictures before we get too far into it.
 
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