The narrow centimetre-wide straps of Thongweed, Himanthalia elongata (L.) Gray, over two metres in length, are shed from the basal disc of this species of seaweed when the reproductive products are ripe. Vast quantities of these seaweed tapes are washed onto Jurassic Coast seashores. They are often turned and tossed by the waves – rolled around until they become tangled and knotted. The photographs show a selection of the naturally-occurring knots, skeins, patterns, and arrangements of this olive-green seaweed. These accumulations of weed were found on the pebbles, stones and gravels of shingle beaches in Dorset.
Revision of a post first published 4 November 2009 as Natural arrangements of Thongweed on shingle
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