To cook is Icelandic moss.

As in our family a first cure for cough in bronchitis and pneumonia is Icelandic moss as one part chopped pine of buds adding in two parts of roots viola fragrant, 4 parts of Icelandic moss, as to mix are all, and one tbl.sp. Mass adding in thermos in glass of hot water, infuse for night, filter, use warm of,half glass for 3 times in a day adding one tea.sp. of honey, and cure such for 3 weeks till a full recovering, and coughing stopping.
Dr.comments this. Cetraria Icelandic or Icelandic moss is nature antibiotic, as anti bacterial, anti virus and absorbing effect having, as thanks for mucus substances in his structure his remedies are  softening irritation, enveloping and calming for mucus membranes of throat, and low breath ways.