Austin Texas Fissidens sp.
I went out and collected some fissidens from Town Lake today. Not sure what species it is but it's a rather large one. It was found fully submerged on a rock. It seems to grow rather well there. It was in a big huge mat. Only grabbed a handful though and lost a bunch while rinsing it in the lake. It was fulllllllll of amphipods and other critters. Will post pics in a little.