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Ferns and Horsetails (Monilophytes)
Clubmosses and Quillworts (Lycophytes)
Main stems procumbent, with flattened erect branches in clumps; leaves in alternate opposing pairs (appearing as rows); sporangia on reduced leaves in cones.

This genus is included in Lycopodium by some authors.

About 16 species in all. 2 species in Britain, 1 in Ireland.
Diphasiastrum alpinum Alpine Clubmoss Diphasiastrum alpinum thumbnail, link to D. alpinum page
Diphasiastrum x issleri Hybrid Alpine Clubmoss Diphasiastrum x issleri thumbnail, link to D. x issleri page
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