Alien fingers (Neomeris annulata) within a tide pool near the Hālona Blowhole on Oahu, Hawaii. “Alien fingers” is a name I came up with. N. annulata is commonly known as Finger algae, Ringed finger seaweed, Caterpillar weed, Spindleweed, and Fuzzy tip algae.
<a href="//commons.wikimedia.org/wiki/User:Coughdrop12" title="User:Coughdrop12">Coughdrop12</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>