I spent an hour and a half on Cefn Bryn in the rain on Saturday and recorded 53 species in an area of flushed ground to the north of Arthur's Stone. Kurzia pauciflora was more frequent here than I've seen elsewhere on Gower, typically growing through mounds of Sphagnum papillosum. Amongst eight Sphagnum, tenellum was the only species of any note.
I only came across one base-enriched flush, where there were small quantities of Palustriella falcata and Sarmentypnum exannulatum mixed in the short turf, which held frequent Campylium stellatum and Scorpidium cossonii.
Grimmia trichophylla & Racomitrium heterostichum were present on several of the rocks in the area, surprisingly this being the first time the latter has been recorded on the Gower peninsula.