Tricholoma borgsjoeënse, or Swedish: borgsjömusseron,[1] is a mushroom of the agaric genus Tricholoma. It is found in Norway, Sweden, and Finland, where it grows among moss in Norway spruce forest. It was described as new to science in 2006.[2] The fungi is brown in appearance and is similar to the brown mushroom. The borgsjömusseron tricholoma has been documented to live in several different European countries.[3] These include Sweden, Norway and Finland. As well as small pockets located in Czechia and Germany.