I must say.....that looks stikingly similar to the two different "microsorum" in this thread:
http://www.aquaticplantcentral.com/f...-narrow-4.html
There appear to be some differences so it is deffinately possible they are different plants......even the two ***misnomer......sorry Aaron***** "narrowleaf tropicas" look completely different from the linked thread.
Verry nice plant,
Did you end up obtaining this plant?
Ken t.