One of the seaweeds with the name Sea Oak, but I did find the odd thallus with a passing resemblance to an oak leaf. A red seaweed, with leafy looking blades growing from a creeping axis. The membranous thallus has a central rib with opposite lateral veins. The margins are toothed and inclined to be frilly.
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A couple of references below:
https://www.seaweed.ie/descriptions/Phycodrys_rubens.html
https://www.aphotomarine.com/red_seaweed_phycodrys_rubens.html

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