To see a really big close up of P. cartilageneum: Click
The genus Plocamium has been called a cosmopolitan of the temperate
seas and is characterized by fine, delicate branching that makes for exceptionally
beautiful herbarium specimens. There are representatives of the genus Plocamium in
all the world's temperate oceans, including South Africa, the Subantarctic,
Australia, New Zealand, Ireland, and California.