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Saltwater algae

Observed: 9th October 2013 By: chris pringchris pring’s reputation in Plants
seaweed
Description:

These circular discs were found on the half tide line. They were about an inch across on short stubby stalks. There were about 100 of them in a small patch on rocks exposed at low tide. I thought they were 'mermaid cups' but don't seem to fit the descriptions in my books.

Identifications
Species interactions

No interactions present.