to the subfamily Lycopodioideae, and Lycopodium is one of 16 genera in the family Lycopodiaceae, with between 9 and 15 species. Species Using the narrow circumscription of Lycopodium, in which it is one of nine genera in the subfamily Lycopodioideae, the Checklist of Ferns and Lycophytes of the World recognized the following species : Lycopodium clavatum L. – stag's-horn clubmoss; subcosmopolitan Lycopodium diaphanum (P.Beauv.) Sw. – Tristan da Cunha Lycopodium japonicum Thunb. – eastern Asia (Japan west and south to India and Sri Lanka) Lycopodium lagopus (Laest. ex C.Hartm.) Zinserl. ex Kuzen. – circumpolar arctic and subarctic Lycopodium papuanum Nessel – New Guinea Lycopodium venustulum Gaudich. – Hawaii, Western Samoa, the Society Islands Lycopodium vestitum Desv. ex Poir. – northwest South America (Andes) Uses The spores of Lycopodium species are harvested and are sold as lycopodium powder. Lycopodium sp. herb has been used in the traditional Austrian medicine internally as tea or externally as compresses for treatment of disorders of the locomotor system, skin, liver and bile, kidneys and urinary tract, infections, rheumatism, and gout, though claims of efficacy are unproven. It has also been used in some United States government chemical warfare test programs such as Operation Dew. Lycopodium powder was also used to determine the molecular size of oleic acid. References External links Species list (takes a broad view of the genus, including the species here separated in the genus Diphasiastrum) Burning Lycopodium Powder: Simulating a Grain Elevator Explosion by Kevin A. Boudreaux Lycopodiaceae Lycophyte genera