Shaggy ink cap and deliquescence

It's a great year for fungi. My brother-in-law in Shropshire sent me this photo of a young Shaggy Ink Cap. It's neither Shaggy nor inky yet but he's keeping an eye on it.

It starts off quite egg like but eventually extends upwards to be a cylinder about 10 cm tall.  The gills deliquesce, or turn black and only.

Coprinus comatus
This is the same one three days later, starting to open up.  Some people know it as a Lawyer's Wig.