This is an odd-looking one! It looked a bit like small potato crisps threaded to make a necklace. It’s really a green seaweed which is also calcareous. This piece has become bleached white after detaching from its original settlement on a rock or coral, and then washed up on the beach at Port Douglas on the Queensland Coast in Australia. It is a species of Halimeda, probably Halimeda discoidea but I’m not certain about that.
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