dulse, palmaria palmata, is a red seaweed belonging to the palmariale species. it has a more or less palmate frond shape, from which its name derives. the reddish-brown blade has a thallus that is dichotomously divided into strips 2 to 3 cm wide and up to 50 cm long. it is attached by a basal disc-shaped holdfast and grows in the intertidal zone on rocky substrates, up to the high water mar ...