Bracket Fungi?

Bracket Fungi?

Observation - Bracket Fungi?. Description: This fungi looks slightly greenish yellow. It is growing high up, so much detail is hard to see. About the size and shape of a pita bread but thicker. (additional) This maybe a Birch Polypore which has been here so long it's got green/yellow algee growing

This fungi looks slightly greenish yellow. It is growing high up, so much detail is hard to see. About the size and shape of a pita bread but thicker. (additional) This maybe a Birch Polypore which has been here so long it's got green/yellow algee growing on it, as I see they change shape into a shelf like fungus.