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It resembles an Anubias Nana Petite, but it's hard to tell from the picture. How long did it take to go from a single leaf to that size plant? Was there a thick stem like portion and some roots, or just the leaf when you got it?
That's some impressive growth for so little time. Generally I consider myself lucky to get one new leaf each week per growth point. I'd concur that you are probably dealing with Anubias Nana or Anubias Nana Petite.
Yes it has grown tremendously well. It basically took the rock over... I moved the riccia to another rock because of it. I am hoping it continues to grow out and not up much more.