What is the meaning of Sea_lettuce?

Any of several edible seaweeds of the genus Ulva.

Similar seaweed species of other genera:

  1. Monostroma spp., also known as the slender sea lettuce, a kind of algae.

Monostroma spp., also known as the slender sea lettuce, a kind of algae.

Scaevola taccada, also known as the beach cabbage, a terrestrial flowering plant species that is native to coastal regions of the Indo-Pacific.

Dudleya caespitosa, also known as the sand lettuce, a terrestrial flowering plant species that is endemic to coastal areas of California

Source: wiktionary.org