Laver

n.
  1. The fronds of certain marine algæ used as food, and for making a sauce called laver sauce. Green laver is the Ulva latissima; purple laver, Porphyra laciniata and Porphyra vulgaris. It is prepared by stewing, either alone or with other vegetables, and with various condiments; -- called also sloke, or sloakan.
    2. Mountain laver (Bot.),
    a reddish gelatinous alga of the genus Palmella, found on the sides of mountains