Fissidens in Pont Rhyd y Fen

Hilary and I saw this small Fissidens yesterday in Pont Rhyd y Fen at the base of an old stone bridge which had a stream running under it. The plants are about 1 cm tall and were growing on the bridge-stone almost on the water line. They were clearly subject to periodic inundation. It's a rather shaded location.

Fissidens at base of stone bridge 

The leaves have a clear, prominent, yellowish border (easy to see in leaves in photo above) and a fairly stout mucro. Photo below shows a low power  microscope view. Again the border looks fairly thick and pigmented and the mucro looks large.

It looks like Fissidens rivularis to me and the habitat is right. Let me know what you think.