Like the yellow stainers in one of the posts yesterday, shaggy inkcaps are quite common, and big enough to spot easily. So, one again, these pictures include specimens from several different locations.
The inkcap group of mushrooms don’t have gills or pores on the underside of their caps to release spores from. Instead they deliquesce – the rim of the cap turns to a mush of spores which disperse as it dries. The process carries on, gradually shrinking the cap. The mushrooms in these pictures are at different stages of that process.
The mush before its spores go is a dark, dense black. That released from a closely related species, the glistening inkcap, has supposedly been used in printing.