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.