Deep dark red rhodophyta; it has a very thin laminar thallus, exclusively lanceolate but not pointed; it is never branched. It has dimensions ranging from few centimetres up to 60 centimeters when it vegetates in eutrophicated waters in the lagoon channels. Its margin is sometimes whitish when the laver is fertile. It has cells which have a rayed pigmentation formation, called chromatophore, and in the centre a pyrenoid, another cytoplasm formation belonging to the plastids, the organelles involved in the photosynthesis. It is formed from a basal disc attached to the substrate, leaves are reddish-brown, ribbon-like, made up of one layer of cells.