Ericaria amentacea (syns.

Cystoseira amentacea, Carpodesmia amentacea) is a large marine brown algae.

[1] Ericaria amentacea occurs in the Azores and the western Mediterranean Sea.

It forms a species complex with Ericaria selaginoides, a similar but non caespitose species from the Northeast Atlantic and western Mediterranean.

[2]