| lichens | Thallophytic plants formed by mutualistic combination of an alga and a fungus, the algal component being a green or blue-green alga, and the fungal usually an ascomycete. (12 Dec 1998) |
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| lichen lichens on bark | A mutualistic association of a fungus andphotosynthetic organism, either a unicellular alga or a cyanobacterium. Some lichens are used to make natural fabric dyes. (09 Oct 1997) |
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