Codium

The "green sea fingers" characteristic of the green alga Codium fragile also give rise to another apt description as "dead man's fingers", because the tubular structures tend to hang from rocks when the tide is low. This common species is a dark green filamentous alga that inhabits the intertidal zone, and is a member of the family Codiaceae, lacking leukoplasts and pyrenoids and having variable thallic forms.