Although a delight to even the casual eye, Corallina officinalis requires close attention for its more subtle beauty to be seen. The fronds are made up of hundreds of hard, pink, articulated tubes, like some tiny machine. Most organisms take some measure to ensure that they’re not eaten: we run away, but Corallina
officinalis builds its fronds out of calcium carbonate and thus makes itself too difficult to eat. ‘Officinalis’, incidentally, is found in the Latin names of species used by apothecaries. In this case, the ground-up seaweed was used to remove intestinal worms—presumably employing the drastic method of scouring them out.