some more info might help.
was it multi stemmed or a maiden, does it have a noticeable scent, is it heavy or light for a green bit of wood, are there any form of visible rays in the endgrain and are any present on quartersawn surfaces, does it react with iron and were there any leaves for identification?
it's location could help as if it was grown on an estate then it could be an unusual species but if it came from the side of the road then it's likely to be a native.
some images of the grain closer up would be great.
it looks like fungally infected ash so far...