This fungus was brought in by a student in my wife's 6th-grade science class. The fungus was found on the ground in woods near Driftwood, TX.

The structure is probably about 8 inches long. (I think the 2nd and 3rd shots are on a standard Rubbermaid lid; the central rectangle of that lid measures just shy of 8" in length.) I'm not sure how it grew or opened up, but it's basically the shape of a partially open banana peel.

I have little familiarity with fungi, but I'm quite certain I've never seen anything like this.