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Have a look also at this thin tissue red algae. I found some on a rock recently and I thought it might be this: Hildenbrandia rubra (Sommerfield) Meneghini
Lat/Lng: 55.57678, -1.63792
OS grid ref: NU229315
Covered pipeline gives walking access to full tidal range. Pink crust exposed on rocks at low water, and also hidden under wracks etc.