Palmaria palmata (L.) Kuntze, also called dulse, dillisk, dilsk or creathnach, is a red alga (Rhodophyta) previously referred to as Rhodymenia palmata (Linnaeus) Greville. It grows on the northern coasts of the Atlantic and Pacific oceans. It is a well-known snack food, and in Iceland it has been an important source of fibre throughout the centuries. Galls, possibly produced by nematodes, copepods and bacteria are known to infect these plants.