Kraus's club moss.
A club moss is any of about 200 species of small, evergreen vascular plants of the phylum Lycopodophyta, related to the ferns and horsetails. Unlike the more primitive true, mosses, club mosses have specialized tissues for transporting water, food, and minerals. They have creeping stems that branch dichotomously and small leaves arranged spirally. They are found mainly in the tropics, but some occur in temperate climates. Millions of years ago their ancestors formed the large trees that dominated Carboniferous forests.