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This is a lime-colored, furry alga. Photos were not taken during high tide; consequently, water dripping from the upside-down, hairlike filaments gives a stalactite-like effect.
I found it in (and just outside of) a small sea cave in the intertidal zone at Tongue Point Marine Sanctuary.
The fourth photo shows how different the algae looks when submerged, and in sharp contrast to the red algae and seaweed (pink-colored Corallina) flanking it.
Spotted on Jun 16, 2019
Submitted on Jun 9, 2020