lichen

1. Any of several eruptive skin diseases characterized by hard thick lesions grouped together and resembling lichens growing on rocks (synset 114252885)
   is a type of: disease of the skin, skin disease, skin disorder - a disease affecting the skin
   subtypes: lichen planus, lichen ruber planus - an eruption of shiny flat-topped purplish (usually itchy) papules on the wrist and forearms and thighs
2. Any thallophytic plant of the division Lichenes;
   Occur as crusty patches or bushy growths on tree trunks or rocks or bare ground etc. (synset 113007816)
   is a type of: fungus - an organism of the kingdom Fungi lacking chlorophyll and feeding on organic matter; ranging from unicellular or multicellular organisms to spore-bearing syncytia
   subtypes:

   • ascolichen - a lichen in which the fungus component is an ascomycete
   • basidiolichen - a lichen in which the fungus component is a basidiomycete
   • lecanora - any lichen of the genus Lecanora; some used in dyeing; some used for food
   • roccella, roccella tinctoria - a source of the dye archil and of litmus
   • beard lichen, beard moss, usnea barbata - greenish grey pendulous lichen growing on trees
   • horsehair lichen, horsetail lichen - any of several lichens of the genus Alectoria having a thallus consisting of filaments resembling hair
   • arctic moss, cladonia rangiferina, reindeer lichen, reindeer moss - an erect greyish branching lichen of Arctic and even some north temperate regions constituting the chief food for reindeer and caribou and sometimes being eaten by humans
   • crotal, crottal, crottle - any of several lichens of the genus Parmelia from which reddish brown or purple dyes are made
   • cetraria islandica, iceland lichen, iceland moss - lichen with branched flattened partly erect thallus that grows in mountainous and Arctic regions; used as a medicine or food for humans and livestock; a source of glycerol
   belongs to: division lichenes, lichenes - comprising the lichens which grow symbiotically with algae; sometimes treated as an independent group more or less coordinate with algae and fungi

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