Laminarian digitata's habitat is the rocky seabed below the low tide line: you will see Laminaria 'plantations' only at the very lowest spring tides. This specimen was torn up by the recent stormy weather and washed ashore. Top to bottom: fronds, stipe (stalk) and holdfast.
Below: closeup of the holdfast. The Laminaria forces tough anchoring filaments into the rocky seabed. The holdfast is also home to a colony of small barnacles and red algae.
Tonnes of Laminaria at the high water line.
A red seaweed (Rodophyceae sp.) growing on a Laminaria stipe.