An intertidal brown seaweed, found on the high shore. It grows up to 40 cm long, without air bladders and lives for up to 4 years. The species can tolerate a high level of desiccation. Fronds have a characteristic ridge along the edge of the receptacles.A number of discrete forms of this species have been recorded. In the UK, a diminutive form Fucus spiralis nanus is relatively common.
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