Scottish National Dictionary (1700–)
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First published 1941 (SND Vol. II).
This entry has not been updated since then but may contain minor corrections and revisions.
BLACK WRACK, n. The prickly tang, Fucus serratus.Sc.
1849
D. Landsborough
Brit. Seaweeds 106:
Fucus serratus. In Scotland it gets the name of black wrack or prickly Tang.