It’s invasion of the mushrooms, people

One wave in a sea of mushrooms

Where the mushrooms are growing, now it’s mushrooms upon mushrooms upon mushrooms up there. Since a sea of brown is not a lovely picture, here’s one of the peripheral clumps, so you can see what they look like. I would compare them to tree ears, except those actually grow on trees. I would ignore them and let them die away, but there’s so much now I wonder what they could be.

Anybody got any mushroom-foraging friends who might know?