Neptune's necklace (Hormosira banksii). This brown alga is also known as sea grapes.

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Photo credit: © DR JEREMY BURGESS/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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Keywords: alga, algal, banksii, biological, biology, botanical, botany, coast, coastal, grapes, hormosira, marine, nature, necklace, neptunes, plant, sea, water