Translations:AY Honors/Marine Algae/Answer Key/28/en

Two fronds of Laminaria digitata washed up on the foreshore of Anglesey, Wales, UK; background is mostly Ascophyllum nodosum. Ascophyllum nodosum

Knotted wrack, Egg wrack (Ascophyllum nodosum)

Where found: It is common on the northwestern coast of Europe (from Svalbard to Portugal) including east Greenland [1] and the northeastern coast of North America.

Description: Ascophyllum nodosum is an edible seaweed of the northern Atlantic Ocean. Ascophyllum nodosum has long fronds with large egg-shaped air-bladders set in the fronds at regular intervals and not stalked. The fronds can reach 2 m in length. They are attached by a holdfast to rocks and boulders. The fronds are olive-brown in color and somewhat compressed but without a mid-rib. This seaweed grows quite slowly and can live for several decades; it may take approximately five years before becoming fertile.