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> Moss need humidity, often lot of humidity, and some shade help preserve 
> it. It usualy grow on trees, or in the water. Moss is usualy green.
> Lichen usualy grow on rocks, often in cool/cold and dry places. It need 
> more light. Lichens are often a greenish shade of gray, and some can be 
> almost white.

Here (Brittany) we have greenish grey, whitish,    and deep gold  lichens
http://www.atlanticbio.com/images/LICHEN%20encroutant%20jaune.jpg
Marc

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