Aonori

Green laver , known as aonori (アオノリ; 青海苔) in Japan, sea cabbage (海白菜) or hutai (滸苔) in China, and parae (파래) in Korean, is a type of edible green seaweed, including species from the genera Monostroma and Ulva (Ulva prolifera, Ulva pertusa, Ulva intestinalis). It is commercially cultivated in some bay areas in Japan, Korea, and Taiwan, such as Ise Bay. It is rich in minerals such as calcium, magnesium, lithium, vitamins, and amino acids such as methionine. It is also called aosa (アオサ, Ulva pertusa) in some places in Japan. It is used in its dried form for Japanese soups, tempura, and material for manufacturing dried nori and tsukudani and rice. It is also used in a powdered form, often blended with Ulva species of Ulvaceae as its production is limited.

Source: Wikipedia