sentence: Some lichen are eaten by humans.
sentences_before: Lichen are the main winter food for reindeer. In summer they have much more choice of food.
sentences_after: A kind of lichen, which is called 'Iwatake' in Japanese and 'Seogi' in Korean language, is collected from cliffs, and used in various Korean and Japanese foods. Lichen have a high level of acid. Care must be taken, as there are at least two kinds of lichen that are toxic.
concept_name: lichen
headings: Lichen Uses
categories: Fungi Botany Bacteria Algae Extremophiles