Phylum: Basidiomycota Family: Hygrophoraceae
Cuphophyllus russocoriaceus (Berkeley & T.K. Miller) Bon
This has a similar appearance to Cuphophyllus virgineus but as the specific name indicates, it has a strong smell of Russian leather. It is often encountered in sizeable groups. Like many waxcaps it prefers unimproved grassland and is happy in acidic and alkaline substrates.
Boertmann, D. (2010 revised second edition) The Genus Hygrocybe
Harries, D. (2017) A Guide to Waxcaps in West Wales
Bessette, A.E. et al. (2012) Waxcap Mushrooms of Eastern North America