What is the difference between lycopodium and equisetum

Lycopodium is a family of fern-allies . They are mostly a flowerless plants with widely branched, with little and simple, needle-like like leaves that cover the branches thickly and stem while Equisetum  usually called horsetail, snake grass because it more like a tail of a horse and its the only living genus in Equisetaceae, a family of vascular plants that reproduce by spores rather than seeds.

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