Synonyms: Acurtis chalybeus (heterotypic); Agaricus chalybeus; Agaricus columbarius (heterotypic); Agaricus lazulinus; Entoloma chalybaeum lazulinum; Entoloma chalybaeum var. lazulinum; Entoloma chalybeum lazulinum; Entoloma chalybeum var. lazulinum; Entoloma lazulinum; Gymnopus chalybeus; Leptonia chalybaea lazulina; Leptonia chalybaea var. lazulina; Leptonia chalybea (heterotypic); Leptonia chalybea var. lazulina; Leptonia chalybea var. squamulosipes; Leptonia lazulea; Leptonia lazulina; Rhodophyllus chalybeus (heterotypic); Rhodophyllus lazulinus