One of New Zealand’s most common brown seaweeds is Neptune’s necklace (Hormosira banksii), with its chains of beads. This is a hardy species, able to withstand time out of water. In sheltered sites it can grow up to half a metre in length, with beads of 2–3 cm in diameter; a smaller form grows on open coasts.
(Thanks to Te Aro - Encyclopaedia of NZ for above information.)
The 'common brick'!