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  2. Lichens and nitrogen cycling - Wikipedia

    en.wikipedia.org/wiki/Lichens_and_nitrogen_cycling

    Lichens are symbiotic organisms that play an important role in the biogeochemical cycle on Earth. The characteristics of lichens, such as strong resistance to factors such as desiccation, ability to grow and break down rocks allow lichen to grow in different types of environment including highly nitrogen limited area such as subarctic heath.

  3. Edible lichen - Wikipedia

    en.wikipedia.org/wiki/Edible_lichen

    Although there are many lichen species throughout the world, only a few species of lichen are known to be both edible and provide any nutrition. [6] Two problems often encountered with eating lichens is that they usually contain mildly toxic secondary compounds, and that lichen polysaccharides are generally indigestible to humans. Many human ...

  4. Foliose lichen - Wikipedia

    en.wikipedia.org/wiki/Foliose_lichen

    A direct correlation exists between pollution and the abundance and distribution of lichen. Foliose lichens are extremely sensitive to sulphur dioxide, which is a by-product of atmospheric pollution. Sulphur dioxide reacts with the chlorophyll in lichen, which produces phaeophytin and magnesium ions. When this reaction occurs in plants the ...

  5. Why lichens are more than just a splash of green on tree ...

    www.aol.com/why-lichens-more-just-splash...

    One reason the greenshield lichen can be more commonly found than other lichen species is because it is relatively tolerant of pollution. Lichens are often used to monitor air quality.

  6. Crustose lichen - Wikipedia

    en.wikipedia.org/wiki/Crustose_lichen

    Crustose lichens on a wall Growth of crustose lichen on a tree trunk. Crustose lichens are lichens that form a crust which strongly adheres to the substrate (soil, rock, tree bark, etc.), making separation from the substrate impossible without destruction. [1] The basic structure of crustose lichens consists of a cortex layer, an algal layer ...

  7. Lichenology - Wikipedia

    en.wikipedia.org/wiki/Lichenology

    The difficulty of giving a definition applicable to every known lichen has been debated since lichenologists first recognised the dual nature of lichens. In 1982 the International Association for Lichenology convened a meeting to adopt a single definition of lichen drawing on the proposals of a committee.

  8. Lichen - Wikipedia

    en.wikipedia.org/wiki/Lichen

    A lichen (/ ˈ l aɪ k ən / LIE-kən, UK also / ˈ l ɪ tʃ ən / LI-chən) is a hybrid colony of algae or cyanobacteria living symbiotically among filaments of multiple fungi species, along with yeasts and bacteria [1] [2] embedded in the cortex or "skin", in a mutualistic relationship.

  9. Symbiosis in lichens - Wikipedia

    en.wikipedia.org/wiki/Symbiosis_in_lichens

    A cyanolichen is a lichen with a cyanobacterium as its main photosynthetic component . [12] Many cyanolichens are small and black, and have limestone as the substrate. Another cyanolichen group, the jelly lichens (e.g., from the genera Collema or Leptogium) are large and foliose (e.g., species of Peltigera, Lobaria, and Degelia. These lichen ...