Club mosses are representatives of the Lycopodiophyta, plants that are very important in the fossil record and in the history of plant life but are not particularly diverse or common now. World-wide t...Club mosses are representatives of the Lycopodiophyta, plants that are very important in the fossil record and in the history of plant life but are not particularly diverse or common now. World-wide there are around 1000 species in the group. As is the case with many of the ferns the common names for club mosses have been much more stable than the scientific names, several of which have been changed in the last thirty years.