: Alonopsis elongata.

Alonopsis elongata is one of the most common littoral species in Norway and is associated with electrolyte poor water. It may have many layers of old shields, which gives it a coffee brown look.

Alonopsis elongata Sars
Creative Commons Attribution | Bjørn Walseng | Norsk institutt for naturforskning
Kart. Utbredelse i Norge.