Similar to H. conica when young, but blackening only slightly when mature. It has a more restricted habitat in preferring unstable dunes, including where rabbits have been active.

References: 
Boertmann, D. (2010 revised second edition) The Genus Hygrocybe
Harries, D. (2017) A Guide to Waxcaps in West Wales
O'Reilly, P. (2016) Fascinated by Fungi