egg wrack

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(knotted wrack)

The common name for the brown seaweed Ascophyllum nodosum. The thallus is flattened and strap-like, branching, with no midrib; there are large, single air bladders. It is found in the middle part of sheltered rocky shores, often in great abundance. It may also be found in salt-water lochs.

Subjects: Plant Sciences and Forestry.

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