Iceland moss : A kind of lichen (Cetraria Icelandica) found from the Arctic regions to the North Temperate zone. It furnishes a nutritious jelly and other forms of food, and is used in pulmonary complaints as a demulcent.

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Taxonomy
Iceland moss, Cetraria islandica, free encyclopedia, Search, bitter taste, appearance, Appalachian Mountains, Ascomycota, body, chlorophyll, cocoa, aperient, Binomial nomenclature, Biological classification, Diethyl ether, Kingdom, Family, Genus.

Defination from the web:
Iceland moss (Cetraria islandica) is a lichen whose erect or ascending foliaceous habit gives it something of the appearance of a moss, ... Iceland Moss. As met with in commerce it is a light-grey harsh cartilaginous body, almost destitute of color, and having a slightly bitter taste. ...