The common Hygrocybe conica, Blackening waxcap found in grassland and sometimes woodland is very similar to this species from dunes. There are subtle differences and spores in the dune species are said to be longer. After rain this fb was extremely bright. Close by was a white species but looking just like conicoides and readily blackening when handled. Boertmann has a similar looking fungus described by Peter Orton as H olivaceonigra but this is now considered to be just a synonym for H conica.