When fungi grow in association with cyanobacteria or single-celled green algae, the resulting structure is called a lichen. Which of the following statements is true of lichens?

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In most lichens, the fungus involved is a basidiomycete, although a few are ascomycetes.

  

Only several hundred lichens have been described to date, but many more are thought to exist.

  

Lichens are the most prevalent colonizers of bare rock surfaces throughout the world.

  

In habitats where lichens are common, the fungus is also found to exist as a free-living organism.

 

asked Dec 29, 2012 in Biology by anonymous
    

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Lichens are the most prevalent colonizers of bare rock surfaces throughout the world.
answered Dec 29, 2012 by anonymous

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