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Washed up on the beach.
I'm so sorry, I forgot to take photos of these seaweeds. But its the typical seaweed you would imagine, dark green and smooth. Wakame is crucial for Japanese cuisine.
Invasive algae, recently arrived to SF Bay. Can grow to 2-3 meters.
Undaria is a genus of kelp which includes Undaria pinnatifida (Wakame).