This is a bitter and twisted fungus! It looks like a standard toadstool that has become deformed from the classic 'mushroom' shape to make a crumpled cap that looks a bit like a saddle, hence its name; the white saddle fungus (Helvella crispa). It is a quite common fungus in broad-leaved woodland appearing, generally, in late summer and throughout the autumn. It is most often found in small groups, occassionally solitary.
It is edible but the bitter taste makes poor eating.