This Polyporus tuberaster, Tuberous Poypore, was growing on a damaged Willow at Pontnewydd. There is a public footpath along a former mineral line from Kidwelli to Pontyberem. The ditches either side of the path are very wet with plenty of rotting wood. An older fb was gowing on Hazel.
The tubes in this species are quite large and irregular. It is said that when found on soil the stipe grows from a 'tuber' or pseudo-sclerotium.
There was a rust on Creeping Buttercup but will leave till another time!