Identification: Is this a kind of fungus on my tree?

I have this on a maple and on a Viburnum rhytidophyllum. The viburnum is nearly dead and I don't know if it's salvageable. It's got new growth but all the older more established branches seem dead. I can peel off pieces of the greenish-grey stuff. It's relatively flat but a little fleshy. Anyone know if this is fungus and, if so, what kind of fungus?

Thanks much!

Kernie

 

Lichen.

 

Thanks for the quick reply, togata57! Do you know what kind of Lichen it is and if it is dangerous to the trees?

 

Dunno the specific name of yours, but I am sure that our expert forum members will. (Perhaps it is one of the foliose kinds, such as shield lichen.)
So far as I know, the lichen will not harm your tree.
Interestingly, lichen is a 'dual organism'---it is both fungus and alga, which live together symbiotically. Cool!

 

I agree with Togata57, it is a shield lichen (in 1st photo), probably Parmelia sulcata, and it will not harm your tree at all.

 

Thanks much Frog and Togota57. I appreciate the help!