Even though the whitish spreading/erect peristome is suggestive of drummondii, I'm suspecting this is just bruchii. The habitat was unusual in that it was growing on rock (ORS quartz conglomerate) fully exposed on a south-facing slope on Cefn Bryn. I've not looked at it under the microscope yet, but if anyone has any thoughts I'd be interested to hear. Possibly one to hang on to giving the proposed split?
wetted plants in situ
Little else of any real note, though a good area of the perennial favourite Ptilidium ciliare amongst Heather and lichens, new for SS58.