Found on a broad sandy beach facing the Southern ocean this very firm, moist, velvety dark green ball was washed up.
I have seen them before but never thought much about them.
A bit larger than a golf ball, very slightly translucent, very dense like it was full of water, tough yet velvety.
Chlorophyta : Bryopsidophyceae : Bryopsidales : Codiaceae
Apparently they can be up to 120mm dia. and are composed of a single cell which can repair itself if damaged.
It appears fluffy underwater.