The Urban Pantheist (urbpan) wrote,
The Urban Pantheist

Urban Nature Pictures day 5

A lichen is a fungus that has enlisted the help of/imprisoned a photosynthesizing organism (a green alga or cyanobacterium) within its tissues. The helper organism/prisoner makes food out of sunlight while the fungus protects it from drying out or being consumed by other microorganisms. Lichens are long-lived and extremely hardy in most environmental conditions (there are lichens in Death Valley and there are lichens in Antarctica) but they are sensitive to air pollution. Urban and industrial areas tend to have poor lichen diversity. Lichenologists can tell, by noticing which species are present in an area, how severe the pollution is.
Tags: franklin park, lichen, urban nature pictures

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