Lycopodiophyta
- Find out about this ancient plant division and its classes. From Wikipedia.
- http://en.wikipedia.org/wiki/Lycopodiophyta

Phylum Lycophyta
- Descriptions and images of Isoetes, Lycopodium, and Selaginella from the three extant families.
- http://botit.botany.wisc.edu/courses/systematics/Phyla/Lycophyta/Lycophyta.html

Introduction to the Lycophyta
- An introduction to club mosses and scale trees, their life history, morphology, ecology, systematics and fossil history.
- http://www.ucmp.berkeley.edu/plants/lycophyta/lycophyta.html