description Fucus spiralis Overview
Fucus spiralis, commonly known as spiral wrack, is a brown seaweed of the North Atlantic. It occupies the upper intertidal zone, where it is exposed to air during part of the tidal cycle. Its flattened fronds have a characteristically twisted or spiraled form, making it distinguishable from other rocky-shore wracks with straighter or differently arranged blades.
help Fucus spiralis FAQ
What is spiral wrack?
Spiral wrack is the common name for Fucus spiralis, a brown seaweed of the North Atlantic. Its flattened fronds have a characteristic twisted or spiraled form.
Where does Fucus spiralis grow?
It occupies the upper intertidal zone, where it is exposed to air during part of the tidal cycle. It is commonly associated with rocky North Atlantic shores.
Why are the fronds of Fucus spiralis twisted?
The species is recognized by flattened fronds that often show a spiral or twisted shape. This form is one of the useful field clues for separating it from other wracks.
Is spiral wrack a plant or an alga?
Fucus spiralis is a brown alga, not a flowering plant. Like other intertidal seaweeds, it is adapted to repeated wetting and drying.
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