FRIENDS OF EDGEWOOD NATURAL PRESERVE

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WHAT AM I?

I come in many colors including several shades of green, yellow and orange. I am a perfect example of a symbiotic (mutually beneficial) relationship. I prefer humidity but can withstand periods of drying and am even heat tolerant.

Because I have no excretory system, I cannot eliminate waste material, and that makes me sensitive to pollution, especially sulfur dioxide. Therefore, scientists use me as a biomonitor. What am I?

Send mail to wm at this domain with questions or comments about this web site. Copyright © 1999 - 2009 Friends of Edgewood Natural Preserve. Last modified: June 13, 2009.