Seen this around a bit but never bothered trying to ID it before..
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It could be. I also wondered if it was the midribs of spiral or bladder wrack after the rest of the thallus has rotted or been eaten.
Where was it in relation to the high tide mark?
I had wondered that as well to be honest, but there seemed to be quite a bit of it and it seemed tough and alive..
It was quite near the level of high tide, the rocks mark it really, the inter-tidal and offshore area is pretty much all silty mud and sand.
Lat/Lng: 54.16857, -2.83348
OS grid ref: SD456750