Porphyra, digital photography manipulation, 8 x 10in, 20.32 x 25.4cm), $300.00 framed Porphyra is a coldwater seaweed that grows in cold, shallow seawater. The marine red alga Porphyra has been cultivated extensively in many Asian countries as an edible seaweed used to wrap the rice and fish that compose the Japanese food sushi, and the Korean food gimbap. Here is my interpretation.