名词 lichen:

1. any of several eruptive skin diseases characterized by hard thick lesions grouped together and resembling lichens growing on rocks

2. any thallophytic plant of the division Lichenes; occur as crusty patches or bushy growths on tree trunks or rocks or bare ground etc.

lichenn.地衣；青苔licheniformn.地衣形茵素lichen alga地衣共生藻lichen iris虹状苔癣lichenified苔藓样变的, 苔藓化的lichen menti[医] 须疮lichen albus白苔癣,苔藓病lichen ruber红苔癣lichen corne[医] 角质性苔癣lichen crust地衣结壳lichenaceousadj.[植] 青苔属的；青苔般的

1. Reproduction in lichens is not well understood.
   地衣繁殖方式还不清楚。
2. A purplish- red dye derived from certain lichens.
   地衣赤染料萃一种从某些地衣中制取的紫红色染料。