Calliergon is a genus of moss in the Hypnales order. Thee species in the genus are commonly referred to as calliergon mosses. Species include: \n* Calliergon cordifolium (Hedw.) Kindb. \n* Calliergon giganteum (Schimp.) Kindb. \n* Calliergon macounii Karcz. \n* Calliergon megalophyllum Mikut. \n* Calliergon obtusifolium Karcz. \n* Calliergon orbicularicordatum (Renauld & Cardot) Broth. \n* Calliergon richardsonii (Mitt.) Kindb. \n* Calliergon stramineum (Brid.) Kindb. \n* Calliergon trifarium (F. Weber & D. Mohr) Kindb.