Small feathery red seaweed attached to rocks in the intertidal zone.
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I have just seen this post (in Jan2014); the delicate structure is only seen under the 'scope, which you have captured so well. In situ and out of water, it usually looks rather uninspiring and could easily be passed by.
Take a moment here please
Lat/Lng: 54.13032, -0.10498
OS grid ref: TA239721