What algae is nori seaweed?

Nori is a type of edible seaweed that primarily comes from species of red algae, particularly those in the genus Porphyra. It is commonly used in Japanese cuisine, especially for wrapping sushi and onigiri. Nori is rich in nutrients, including vitamins, minerals, and protein, making it a popular health food. The seaweed is typically harvested, processed, and dried into thin sheets for culinary use.