Help ID this Mushroom - coprinus

I have a few of these growing by a dead slippery elm in central texas. They are bullet shaped kind of round, off-white skin is semi-smooth with a little taring/flaking(tearing onthe small one is from me picking it, larger one outside, tore "naturally"), the inside is very dark brown. i do not think they are mature. The large one is about 9" tall
sorry about to poor quality of the picture.

It looks like a coprinus. don't know what species though. the picture quality is too poor to tell. does it have a ring on the stem?

If it's a coprinus, it should be a pile of black goo in the morning. Can you take a spore (or goo, if that's the case) print of it?