ulva

A genus of algæ, typical of the order Ulvaceæ, having a flat membranaceous bright-green frond. U. latissima and U. Lactuca are sometimes eaten. See green laver (under laver), sea-lettuce (under lettuce), and Enteromorpha.

A genus of thin papery bright green seaweeds including the kinds called sea lettuce.

type genus of the family Ulvaceae; green seaweed having a thallus two cells thick: sea lettuce