A fungus among us

A fungus among us

I found this growing in two different spots in my yard yesterday. I'm not sure what it is other than a fungus. I removed all of it that I could find along with the soil around it to try and get all of the spores. Anyone have any ideas as to what it is exactly? Anyone know if it's poisonous? Any other ideas as to how to terminate it other than what I've already done? I expected it to be fairly soft and I was surprised to find that it was very firm to the touch. I live in St. Louis, Missouri in a pocket zone of 6/7 if that matters. thanks in advance *if you click on the pic it'll get larger for you so you can see it better*
Wondering what it is?

Wondering what it is?

A hardy caladium

A hardy caladium

Mystery plant

Mystery plant

The grass really IS greener on the other side!

The grass really IS greener on the other side!

Terrarium Plant Question

Terrarium Plant Question

Backyard in progress

Backyard in progress