Marginal moss, also known as moss strips, moss cabbage, belongs to the green algae door Ulva schreberi family marginal moss genus, is living in the offshore shoals of the natural wild green algae, natural reproduction ability is particularly strong. Marginal moss mainly grows in the intertidal zone on the rocks, and sometimes can also be attached to the large seaweed algae, widely distributed in the world's seas, to the majority of Asia, some species in the semi-saline water or rivers can also be seen.

Marginal moss is rich in carbohydrates, protein, crude fiber, minerals, fat and vitamins, of which the highest iodine content in the strip of marginal moss, is the ideal raw material for natural nutritional food, but the wild marginal moss is mixed with other aquatic grasses and sediments, the taste is very poor. Fresh moss strips can be eaten after drying in the sun, and after it is chopped and ground finely, it is sprinkled in pastry treats with a special flavor.

Morphological features:

Algae body bright green, composed of a single layer of cells, enclosed in tubes or adhering to the band. Cell arrangement related to species, mononuclear, starch nucleus one to more. Chromatophore lamellar, 1. Single or branched, up to 1 m tall, basally composed of pseudoradical filaments in a discoidal fixation apparatus. Asexual or sexual reproduction, gametes can be nutritive reproduction, life history of sporophyte and gametophyte isomorphic alternating generations.

Tubular membranous, tufted, with conspicuous main branches and slender branches, up to 1 meter high. The base is attached to the rock by a fixer, and grows on mudflats, gravel in the mid-tidal zone.

The alga is erect, tubular and hollow or at least hollow in the stalk and marginal part of the alga, and the tubular part consists of a single layer of cells. The algal body is single or branched, cylindrical, sometimes partially compressed. Cells at the base of the algal body bear pseudoradical filaments, which downwardly form a cementum. Each cell has a nucleus, a lamellar chloroplast, and often one or more protein nuclei.