I always seem to start these queries by saying 'I'm sure this is something obvious, but I can't work out what it is'. This one is no exception.
Collected from near the Bazzania site at Taffs Well, it was growing in woodland but I can't now remember whether it was directly on the woodland floor or on a log.
It has the general look of Rhynchostegium confertum but the leaves appear nerveless and the setae look too long for that species. The basal cells are reddish though the stems are green. I have a feeling I've seen this before but I'd not managed to key it out satisfactorily.
Thanks for any suggestions.