I am not an expert in identifying fungi, but yours look a lot like sulphur polyphore, a type of shelf fungus that could indicate more extensive internal damage.  I would suggest that you contact a certified arborist by searching for the International Society of Arborists.  Their website allows you to put in your zip code and find ones near you.  You could also send this photo to the NCSU Plant and Insect Disease Clinic.  Link below.  They will analyze photos free, but there is a charge if you send a sample in.  Extension master gardeners are not allowed to make house calls, so we can’t evaluate it in person. 

https://pdic.ces.ncsu.edu/