Dictyota spiralis is a species of brown alga found in the temperate eastern Atlantic Ocean and the Mediterranean Sea.

The thallus of Dictyota spiralis is a yellowish-brown colour, sometimes with a greenish iridescent tip.

It forms clumps of membranous, flattened, ribbon-like fronds with few branches, up to 15 cm (6 in) long and 4 mm (0.2 in) wide.

The clump is anchored to the seabed by stolons.

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