Detholiad o Morris, L., 1748. Plans of Harbours, Bars, Bays and Roads in St. George's Channel. Mae'r detholiad (tudalen 52) yn disgrifio'r planhigyn môr sydd i'w ganfod o amgylch Laurenny (sef Lawrenny heddiw).

Mae'r detholiad yn darllen fel a ganlyn: “Here grows a Sea Plant, called Laverbread, or which is made Black Butter; a great Rarity”