serrated wrack

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(toothed wrack)

The common name for the brown seaweed Fucus serratus. The thallus is flattened and branched, and the edges are serrated with forward-pointing teeth. The wrack is found near low-water mark and is very common. Small white coiled tubes of the worm Spirorbis are commonly found on the surface of the thallus.

Subjects: Plant Sciences and Forestry.

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