I finished the readily identifiable queries from my Tarren y Gigfran excursion, and am now left with a pile of confusing Racomitrium samples! These are all from the sandstone block screes except the first one which was on the crag itself. Sorry for all the photos but hopefully it will help with Racomitrium queries more generally - best to click each one to enlarge it to see more detail.
4 & 5: these two growing together. Both have long hair points, though the plant on the right is more slender and somewhat falcate (not so obvious in the pic). Perhaps both are R. heterostichum?
Thanks for any advice.