looks to be Black cherry Prunus serotina.
This is probably a large Apiosporina morbosa canker

The other tree I found this species on was not ash but a Hornbean. (Oystrya) I thought it was an ash my bad/

I see it frequently on Betula and Alnus, but as it’s been said here, it also grows on elm in North America. Is this elm, maybe?
In Europe, we have another species on elm (ulmicola), that doesn’t produce chaga.

I have been taking Shiitake, Maitake, and Reishi everyday and am looking forward to adding Chaga to the list :)

but I have also found them on Beech see http://mushroomobserver.org/23236?search_seq=1268093 and I have found them on Ash.As far as a medicinal mushroom I drink Chaga tea ever day and I think it has strong Immune boosting capabilities. I have never been sick in the ten years of drinking it. I have made soap with it also but not sure if it works or not. The chemicals are in a form of complex polysaccharides. also it it good for cancer so im told.

North American Polypores by Gilbertson & Ryvarden says it grows on Betula, rarely on Ulmus, Fagus and Ostrya.

The tree this was growing on is not a birch tree. From what I have read they prefer birch trees. What other trees do they grow on?

I am curious about this, can someone please help me clear this up?

I would like to add chaga to my medicinal mushroom stash I take everyday. Also I have read that chaga can be burnt down to ash and the ash can be used to make an antibacterial soap.