Ink cap - but which sort?

Ink cap - but which sort?

Observation - Ink cap - but which sort? - UK and Ireland. Description: This had a bright yellow stipe with an olive green/brown cap when I found it a few hours ago but has already turned black. I have assumed it's an inkcap because of this and the heaviness/denseness of the gills but am not sure.

This had a bright yellow stipe with an olive green/brown cap when I found it a few hours ago but has already turned black.
I have assumed it's an inkcap because of this and the heaviness/denseness of the gills but am not sure.