Diphasiastrum, Hupersia, Lycopodiella, and Lycopodium spp.; club moss [Lycopodiaceae]  Small, erect, trailing, or creeping, evergreen perennial plants with narrow, simple, crowded leaves.  Some species look a bit like conifer seedlings.  Sexual reproduction is by bisexual gametophytes produced by a single type of spore, but most propagation is by running growth while older parts of the plant die off.  Eighteen species in Wisconsin, half a dozen common, mostly in woodland or forest understories.  [004]

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