Neptune's necklace (Hormosira banksii also known as sea grapes or bubbleweed) is a species of seaweed (brown algae, Fucales) found in Australia and New Zealand. Its strings of olive-brown hollow beads have a slimy layer to conserve moisture, and they are commonly found in rock pools at mid-tide levels. Each bead is filled with water to prevent desiccation between tides, plus gas to rise to the sea surface for sunlight and movement in currents. Maria Island, Tasmania, Australia.
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