Date:   3/26/2013 11:04:56 PM ( 11 y ago)
Hits:   3,096
URL:   https://www.curezone.org/forums/fm.asp?i=2049493

Looks like lichen which is a cross between fungus and algae.

http://www.mycolog.com/lichens.htm


There are so many kinds I have no idea which species you have though. I've read that lichen mostly grow where the air is very clean : )

 

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