The Lycopodiaceae (class Lycopodiopsida, order Lycopodiales) are a family of vascular plants, including all of the core clubmosses, comprising 16 accepted genera  and ca 400 known species. These plants bear spores on specialized structures at the apex of a shoot; they resemble a tiny battle club, from which the common name derives. They are non-flowering and do not produce seeds.
P.Beauv. ex Mirb. 1802
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The genera Huperzia, Phlegmariurus and Phylloglossum, the species of which were generally included in a more broadly defined Lycopodium in older classifications, are now all placed in Huperzia although some authors prefer to separate these in the family Huperziaceae; they differ in producing spores in small lateral structures in the leaf axils. There is as yet no consensus on the recognition of Huperziaceae as a separate family; a more broadly defined Lycopodiaceae, including these genera, is still recognized in most general classifications.
The species within this family generally have chromosome counts of n=34. A notable exception are the species in Lycopodium subgenus Diphasiastrum, which have counts of n=23.
- The running clubmosses (Lycopodium subgenus Diphasiastrum) have long been used as greenery for Christmas decoration.
- The spores have long been used as a flash powder. See Lycopodium powder.
- The spores have been used by violin makers for centuries as a pore filler.
- In Cornwall, club mosses gathered during certain lunar phases were historically used as a remedy for eye disease.
Subfamily Lycopodielloideae Wagner & Beitel 1992 ex Øllgaard 2015
- Lateristachys Holub 1983
- Lycopodiella Holub 1964
- Palinhaea Franco & Vasconcellos 1967 nom. cons.
- Pseudolycopodiella Holub 1983
Subfamily Lycopodioideae Eaton 1833 sensu Wagner & Beitel 1992 ex Øllgaard 2015
- Austrolycopodium Holub 1991
- Dendrolycopodium Haines 2003
- Diphasiastrum Holub 1975
- Diphasium Presl ex Rothmaler 1944
- Lycopodiastrum Holub 1975 ex Dixit 1981
- Lycopodium Linnaeus 1753 sensu stricto
- Pseudodiphasium Holub 1983
- Pseudolycopodium Holub 1983
- Spinulum Haines 2003
Subfamily Huperzioideae Rothmaler 1962 sensu Wagner & Beitel 1992 ex Øllgaard 2015
- James L. Reveal, Indices Nominum Supragenericorum Plantarum Vascularium
- PPG I (2016), A community-derived classification for extant lycophytes and ferns. Journal of Systematics and Evolution, 54: 563–603. doi:10.1111/jse.12229
- Christenhusz, M. J. M. & Byng, J. W. (2016). "The number of known plants species in the world and its annual increase". Phytotaxa. Magnolia Press. 261 (3): 201–217. doi:10.11646/phytotaxa.261.3.1.
- PPG I (2016), A community-derived classification for extant lycophytes and ferns. Journal of Sytematics and Evolution, 54: 563–603. doi:10.1111/jse.12229
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