Found in 45+ years worth of zone 5 natural woodland. Not old-growth forest, but there are a lot of towering trees in there.
I haven't ever seen anything like this in the area before and I wouldn't have a clue as to where to look for the answer; other than here of course!;-)
The specimen is about 3" high, by 2 and 1/2" wide. Pretty small. It's growing in fertile silty-clay soil with plentiful humus.
Any ideas?