Cuphophyllus is a genus of agaric fungi in the family Hygrophoraceae. Cuphophyllus species belong to a group known as waxcaps in English, sometimes also waxy caps in North America or waxgills in New Zealand. In Europe, Cuphophyllus species are typical of waxcap grasslands, a declining habitat due to changing agricultural practices. As a result, four species, Cuphophyllus atlanticus (as C. canescens), C. colemannianus, C. lacmus, and are of global conservation concern and are listed as "vulnerable" on the IUCN Red List of Threatened Species.