Large masses of dark brown/purple - sponge-like - unusual grown pattern. Growing on large rocks groins - uncovered at low tide.
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Going by the first photo i would have said it was man made however the second photo looks like there is a grain that points to one or two of the "dips" in it. So my first guess has gone wrong and my second is going to have to be fungus subject to there being such a thing that grows on sea weed and can be immersed in sea water twice a day.
Absolutely real and growing!! Definitely not
man-made! It was growing directly onto the rocks, not on the seaweed.
It may end up with an expert google search using phrases from our own description and see if anything comes up.
I believe this is a red alga (rhodophyta) - possibly polysiphonia spp. Rhodochorton (tends to encrust - hard) and Rhodothamniella can also form turfs like this - more like encrusters though and usually in smaller tufts.
Thank you - I will check this out.
Under the microscope it consists of minute red strands, some of which splay out at tip.
Perhaps the motion of the waves causes the effect as in photo....
...tempted to move to plants and see if someone elsse can shed any light on this.
It is good to hear we have got a microscope on the job now. The grain i can see in the photo has shown up more clearly. Yes it looks like the waves have shaped it a bit too.
Lat/Lng: 50.734472, -1.725197
OS grid ref: SZ194927