A large Seaweed

A large Seaweed

Observation - A large Seaweed - UK and Ireland. Description: One of the large shiny very flexible seaweeds washed up on a rocky shore. What Species please? This one approx 35cm across the 'palm' of the 'hand'.

One of the large shiny very flexible seaweeds washed up on a rocky shore. What Species please? This one approx 35cm across the 'palm' of the 'hand'.