Sea lettuce has a green, branched thallus with ruffled margins, attached to the substrate by a small disc-shaped holdfast.
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Some species of the sea-lettuce genus Ulva contain essential amino acids, with varying concentrations; protein-composition findings for one species cannot be generalized to every species in the genus.
Evidence: SRC-252 · SRC-CIX28-UL-LORDAN2011
Approved version OWNER-REVIEW-20261028T112912409 · last approved 28 October 2026