Description: Thallus tough and leathery, growing to 150 cms long, frond broad with branches to 2 cms wide and a clear midrib. The margins, including the apex, show sharp forward-pointing teeth.

Habitat: Very common in masses on rock covering much of a shore in the lower littoral. Between Acscphyllum nodosum and Fucus vesiculosus except in exposed sites where the species is rare or absent. Without bladders.

Distribution: Common on all coasts of the British Isles except the most exposed and the most sheltered. Common in most of Europe: Portugal, Spain, France, Netherlands, Baltic, Norway and Iceland. Greenland. Atlantic coast of North America: Canada. Further afield: Spitzbergen, the Murman Sea, the White Sea and Baffin Bay.

Similar Species: Other large Fucus species.

Key Identification Features:

• Flat and tough with serrated teeth along the margins.

Distribution Map from NBN: Fucus serratus at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Fucus serratus at iNaturalist World Species Observations database.

WoRMS: Fucus serratus at World Register of Marine Species. Accepted name: Fucus serratus Linnaeus, 1753. AphiaID: 145546.

Classification: Biota; Chromista; Harosa; Heterokonta; Ochrophyta; Phaeophyceae; Fucophycidae; Fucales; Fucaceae; Fucus