Characteristics
Club-mosses are homosporous, but spike-mosses and quillworts are heterosporous, with female spores larger than the male, and gametophytes forming entirely within the spore walls.
The spores of Lycopodiophyta are highly flammable and so have been used in fireworks. Currently, huperzine, a chemical isolated from a Chinese clubmoss, is under investigation as a possible treatment for Alzheimer's disease.
Read more about this topic: Lycopodiophyta