- Kingdom: Plantae
- Phylum: Rhodophyta
- Class: Florideophyceae
- Order: Gigartinales
- Family: Cystocloniaceae
- Scientific name: Cystoclonium purpureum
- Norwegian: fiskeløk
This is a heavily branched seaweed that may reach a height of 60 cm. The fronds have a dull purple color and are only 3 mm wide.
It is found on stones, rocks or other seaweeds in or just below the tidal zone.
It is registered on both side of the North Atlantic Ocean, including Iceland.