Hygrophorus caeruleus, commonly known as the blue wood waxcap, is a type of mushroom found in woodland areas. It is known for its vibrant blue coloring and waxy texture. While it is commonly referred to as the blue wood waxcap, there are a few synonyms for the species. These include Hygrophorus aeruginosus, Hygrophorus olivaceoalbus, and Hygrophorus olivaceo-albus. All of these synonyms refer to the same species, but may be used interchangeably depending on the context. Whether you refer to it as the blue wood waxcap or one of its synonyms, this mushroom is a beautiful and fascinating addition to any woodland ecosystem.