Image of Neptune's necklace

Description:

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. It is commonly found in rock pools at mid-tide levels and is characterised by strings of olive-brown hollow beads. The beads have a slimy layer which conserves moisture.