Pretty polly is a red algae and one of extremely many varieties within this type of plant. It grows on rocks where it can attach its roots. Red algae prefer warmer seas and high salinity, which is why it is most often seen in the area around the Kattegat (Denmark), where the salt content is high. The finely branched feathered foliage of pretty polly, branches beautifully like a shrub as long as it lies in the water. If you pick it up, it clumps together.
Did you know that:
The Vikings ate pretty polly which should have special healing properties and today it is used in Japanese cuisine in certain sushi dishes.