Frond of wrack with bubbles found around middle shore
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Hi, this is almost certainly bladder wrack, the other type of wrack that has similar 'bladders' is egg wrack however egg wrack doesn't have a midrib (the line running down the middle of the seaweed) that you can see in your photo.
To find out about what's going on in the south west check out http://www.ispot.org.uk/forum/8409
Lat/Lng: 56.0, -3.6
OS grid ref: NT0580