This small brown seaweed of undetermined species (possibly a Sargassum sp.) was one of several small brown seaweeds making up the algal "fuzz" covering all the well-lighted rock faces beyond about 10 metres depth at Montecristo.
The Rainbow Warrior is in the Mediterranean for a three-month ship tour taking action on the threats to the sea and calling for a network of large-scale marine reserves to protect the health and productivity of the Mediterranean Sea.