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Noun lichen has 2 senses
  1. lichen - any of several eruptive skin diseases characterized by hard thick lesions grouped together and resembling lichens growing on rocks
    --1 is a kind of     skin disease, disease of the skin, skin disorder, skin problem, skin condition
    --1 has particulars: lichen planus, lichen ruber planus
  2. lichen - any thallophytic plant of the division Lichenes; occur as crusty patches or bushy growths on tree trunks or rocks or bare ground etc.
    --2 is a kind of     fungus
    --2 is a member of Lichenes, division Lichenes
    --2 has particulars:
     ascolichen; basidiolichen; lecanora; roccella, Roccella tinctoria; beard lichen, beard moss, Usnea barbata; horsehair lichen, horsetail lichen; reindeer moss, reindeer lichen, arctic moss, Cladonia rangiferina; crottle, crottal, crotal; Iceland moss, Iceland lichen, Cetraria islandica
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