Himanthalia elongata
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Himanthalia elongata is a brown alga in the order Fucales, also known by the common names thongweed, sea thong and sea spaghetti. It is found in the north east Atlantic Ocean and the North Sea.
Thongweed at Rossnowlagh, Ireland.
Young thallus of Himanthalia elongata
Fucus serratus
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Fucus serratus is a seaweed of the north Atlantic Ocean, known as toothed wrack, serrated wrack, or saw wrack.
Fucus serratus in its natural habitat
The eggs or sperm (here) form in conceptacles sunken in receptacles towards the tips on the branches.
The lamina shows cryptostomata – small cavities which produce colourless hairs.