Knowra Cetraria islandica Cetraria islandica Cetraria islandica, commonly called Iceland moss, is a fruticose lichen of northern regions. It has traditionally been gathered as food and used in herbal preparations.
Lichen : A stable association between a fungus and a photosynthetic partner, usually an alga or cyanobacterium. Cetraria islandica is a lichen, not a moss despite its common name.
Lichen as food : The use of lichens as human food, usually after processing to improve taste or digestibility. Iceland moss has been gathered and prepared as food in northern communities.
Erik Acharius : A Swedish botanist whose work established lichenology as a systematic discipline. Acharius described Cetraria islandica in the early development of formal lichen classification.
Cetraria islandica identification : The identification of Cetraria islandica using its branching lobes, surface features, and habitat. Field identification distinguishes the gathered species from other northern lichens.
Fruticose lichen : A lichen growth form with a branching or shrubby thallus, attached to its substrate at a limited point. Its upright, branched thallus gives Cetraria islandica its characteristic form.
Iceland moss tea : An infusion or decoction prepared from Cetraria islandica, traditionally consumed as a herbal drink. This is one direct way the lichen has been used in herbal preparations.
Linnaean taxonomy : A system of biological classification that names organisms with a genus and a species epithet. The binomial Cetraria islandica follows this standard naming system.
Lichenometry : A dating method that estimates the age of exposed surfaces from the size of lichen thalli. Lichen growth offers a way to study the age of surfaces in habitats where the species occurs.
Thallus : The body of an alga, fungus, or lichen, not differentiated into true roots, stems, and leaves. The lobed thallus is the structure harvested and identified as Iceland moss.
Lichen polysaccharides : Complex carbohydrates found in lichen tissues, including compounds that can form mucilaginous solutions. Its polysaccharides contribute to the thick texture of preparations made from the thallus.
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