Description: Ulva intestinalis is a green alga in the family Ulvaceae, known by the common names sea lettuce, gutweed and grass kelp. Until they were reclassified by genetic work completed in the early 2000s, the tubular members of the sea lettuce genus Ulva were placed in the genus Enteromorpha. https://en.wikipedia.org/wiki/Ulva_intestinalis

Description: The sea lettuces comprise the genus Ulva, a group of edible green algae that is widely distributed along the coasts of the world's oceans. The type species within the genus Ulva is Ulva lactuca, lactuca being Latin for "lettuce". The genus also includes the species previously classified under the genus Enteromorpha, the former members of which are known under the common name green nori. https://en.wikipedia.org/wiki/Sea_lettuce