Botanical Overview
Cetraria islandica (Iceland moss) is a lichen in the Parmeliaceae family. It is traditionally harvested from northern and Arctic regions including Northern Europe, the Arctic, Subarctic, and parts of North America. The primary part used medicinally is the thallus, the lichen body.
Common names include Iceland moss, Iceland lichen, and Lichen islandicus.
Energetics
This herb is considered cooling in temperature and moistening in moisture quality. It has bitter, sweet, and mucilaginous tastes, with a descending directionality and a tonifying effect. It mainly influences qi and fluid systems.
Primary Actions
- Demulcent
- Expectorant
- Emollient
- Nourishing
- Mild antimicrobial
- Anti-inflammatory
Indications
Western
- Cough
- Bronchitis
- Sore throat
- Gastric irritation
- Indigestion
- Diarrhea
- Skin inflammation
Syndromes
- Respiratory catarrh
- Gastric mucosa inflammation
- Mild respiratory infections
- Digestive disorders with mucosal irritation
TCM
No established uses documented.
Ayurveda
No established uses documented.
Unani
No established uses documented.
Constituents & Mechanisms
Contains lichen acids such as cetraric acid and fumarprotocetraric acid, polysaccharides (lichenan), mucilages, and fatty acids which contribute to its demulcent and mild antimicrobial properties.
Dosage & Preparations
- Infusion: 2-4 g dried thallus in hot water, 1-3 times daily
- Decoction: simmered preparation for respiratory ailments
- Powder: 1-3 g orally
- Syrup preparations with Iceland moss extract
Safety & Contraindications
Generally safe in traditional usage though allergic reactions are possible. Contraindicated in pregnancy and lactation due to insufficient safety data. Not recommended for those allergic to lichens. Large doses may cause mild gastrointestinal discomfort.
Astrological Correspondences
No reliable sources found for planetary or elemental rulers; correspondences not assigned.
Selected References
- Community herbal monograph on Cetraria islandica (L.) Ach., European Medicines Agency, 2016
- Cetraria islandica (Iceland moss), Plants For A Future (PFAF)
- Commission E Monograph on Iceland Moss, Weber & Busse, 2007
- Iceland moss, Natural Medicines Comprehensive Database