Seaweed: the laver occurs in the insignia of the town of Liverpool, (in allusion to the name). The same arms were borne also as an augmentation by the Earl of Liverpool, created Earl in 1796. In a French example feuille de varech, i.e. of wrack, has been observed in one blazon.
Argent, a[lever or] cormorant sable beaked and legged gules, holding in the beak a branch of seaweed called laver inverted vert[originally the eagle of S.John holding a penner and inkhorn]--City of LIVERPOOL.
D'argent, a une feuille de varech de gueules accostée de deux crois sants d'azure--BEUARD, Normandie.