This looks like some slightly burned sulfuric outcrop, but it is a mushroom:

Olympus XZ-1, 28mm, ISO100, f8, 1/2s
This one looks edible to me, except for the spider, but don't take my word for it:

Olympus XZ-1, 28mm, ISO100, f8, 1/250s
More when I see them.
A fun photography topic - here is one I took in Japan a little while ago
Nice! Looks like it is pretending to be a flower.