I did some riverbank recording alongside the Rhymney in eastern Cardiff (ST2282 and ST2281) last weekend. The tetrads in which these squares fall have hardly any Glamorgan records, but there might well be Monmouthshire records from the far bank.
It was the first river-side recording I've done this season, so it felt very much like catching up with old friends which I hadn't seen since last winter - Syntrichia latifolia, Homalia trichomanoides, Plagiomnium rostratum and Leskea polycarpa. I almost drew a blank on the latter species, but a single sycamore was completely plastered in it.
Although in character the habitats felt very much like those by the Taff, there were a couple of species missing which I encountered regularly there - Cinclidotus fontinaloides and Mnium marginatum (despite some silty bays which looked perfect for the latter species). In their place was plenty of Aneura pinguis, which I've not seen by the Taff. It will be interesting to see if this pattern is continued as I work further upstream on the Rhymney.
The field alongside the river had a grassy mound with some soil gaps - these held Phascum cuspidatum and Tortula modica.