Well, I can't imagine this ever being edible. Also it formed in just a matter of a few days, it was not there just a week or so ago according to the club member who found it. It was very hard, wood like. I have had slime mold here in my yard, but it was never hard like this. Don't know about any tubular structures inside of it.
The only thing I could find that sounded like this was Shelf fungus, but that also appeared to normally grow on trees.