A closer view of inkcaps already posted here. The picture above is of the newest mushroom, which has a surface still covered in fine white hair-like structures.
The other picture shows the second-newest, with the rim of the cap already marked by the ongoing deliquescence.
These are probably coprinus lagopides, a reasonably common inkcap, though one without a vernacular name. Alternatively, it may be the less frequently encountered coprinus lagopus.