Also known as Dead Man's Fingers, Felt Algae, Felty Fingers, Forked Felt Algae, Fragile Codium, Green Fleece, Green Sponge, Macro Algae, Oyster Thief, Sea Staghorn, Sponge Seaweed, Stag Seaweed.
Found in branching fronds hanging down from rocks at low tide with their finger like branches hence the names over shallow high energy zones along shorelines.
Length - 30cm
Depth - ?m
Widespread North Atlantic Ocean, Mediterranean, Pacific Ocean
As many as 9000 species of algae are spread across the worlds oceans, some can be as much as 30 metres across while others are just a slippery scum over rocks.
Algae grows wherever there is enough light and life supporting conditions.
They support a huge number of marine life both for food and as a home. Ref: https://en.wikipedia.org/wiki/Codium_fragile