why has my acer got a fungus on
By Miken2078
United Kingdom 
in a pot in sheltered yard
On plant
Acer
10 Aug, 2009
Answers
Moon grower is absolutely right - it does no harm at all and I think it is rather beautiful! ;-)
10 Aug, 2009
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That isn't fungus it is lichen and indicates you live in a part of the country with good clean air. It is not harming the tree in any way, take a look at http://www.savatree.com/are-lichen-harmful.html
10 Aug, 2009