Neopyropia koreana belongs to a group of red algae which grow in a sheet-like form, often called 'laver' or 'nori'. Gametophytic blades are round, oval, or elongated, attached to a minute cord-like stem and a disk-shaped holdfast. The blades are smooth in rounder forms, but ruffled when they are more elongated. The blades are 10 to 125 mm wide, and 30 to 180 mm long. The blades are monecious, with adjacent patches of male and female gametangia (reproductive structures(.,, This algae grow on various algae, ropes, and other surfaces.. Neopyropia koreana was described from Korea where it is native. Although we haven't found reports from elsewhere in Asia, this alga has been reported from Italy, Greece, Spain, Australia, and New Zealand.. It has been collected at sites from Casco Bay to Long Island Sound, Possible vectors include hull fouling of ships and unsuccessful plantings of Pacific Oysters.