Nick Upton / Toothed / Serrated wrack (Fucus serratus) submerged at mid tide, near Falmouth, Cornwall, UK, August.

Nick Upton / Split level view of Toothed / Serrated wrack (Fucus serratus) clumps at mid tide, near Falmouth, Cornwall, UK, August.

Adrian Davies / Serrated wrack (Fucus serratus) UK, July

Robert Thompson / Serrated wrack {Fucus serratus} exposed at low tide, Ballyhenry Point, Strangford Lough, County Down, Northern Ireland, UK, September

David Tipling / Toothed / Serrated wrack {Fucus serratus} exposed at low tide, Isles of Scilly, Cornwall, UK

Jason Smalley / Serrated wrack {Fucus serratus} and Kelp, probably Tangle oarweed {Laminaria digitata} Stackpole, Pembrokeshire, Wales, UK

Geoff Simpson / Serrated wrack seaweed {Fucus serratus} exposed at low tide, Gwynned, Wales, UK

Niall Benvie / Serrated (Toothed) wrack (Fucus serratus) with marine mollusc (Littorina littoralis) on the seaweed. Scotland, UK, Europe

Lewis Jefferies / Grey seal (Halichoerus grypus) amongst Serated wrack (Fucus serratus) and Thongweed (Himanthalia elongata) on seabed, Lundy Island, Bristol Channel, Devon, UK.

Alex Mustard / Serrated wrack (Fucus serratus) and Spaghetti seaweed (Himanthalia elongata) growing in abundance on seabed, Island of Coll, Inner Hebrides, Scotland, UK, Atlantic Ocean.

Alex Mustard / Seaweeds in shallow water, with thongweed (Himanthalia elongata) growing over serrated wrack (Fucus serratus). Falmouth, Cornwall, England, United Kingdom. British Isles. North East Atlantic Ocean.

Alex Mustard / Serrated wrack (Fucus serratus) reflected in the surface as it grows in a rockpool. Looe, Cornwall, England, United Kingdom. British Isles. English Channel, North East Atlantic.