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It's indeed moss. I remember that these mushrooms were tiny ones, some few centimeters high and the ground was full of that fresh and soft moss.
Central Switzerland, where I took the photo, is known to be very wet and some sorts of moss can grow up to that size. But it can not be compared with the moss that I saw in the woods near Gustavus, Alaska in the early 90ies. By places it was at least 30 to 50 cm high. I didn't know that either before, but moss can grow quite high under favourable conditions.
Add to that the fact that I was lying on the ground for this photo. It was supposed to be a so-called "bugs eye" shot and I guess for the bug, whose view I try to imitate in these shots, this moss really looks like fern.
Have a great day, @kus-knee! :)

Thanks for the explanation. You're a real adventurer!