distinctive green sea weed. Edible
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This is an old post, made when spades were spades - now they are soil-cutting implements, with a variation of handle styles and often with regional names!
So - this cannot be (in 2015) Ulva lactuca unless you have examined the cell structure. Despite the web offering a range of lookalikes all with the name U.lactuca. If you are as confused as I was (still am to some extent) then dial Ulval lactuca cell structure into you fave Browser.
So as not to be a spoilsport, I have not offered Ulva as the ID because, in 2010, everyone thought this was lactuca
Name withheld! Ha!
Lat/Lng: 53.1, -6.1
OS grid ref: SG2674