Lycophyta

The Lycophyta is a tracheophyte division of the kingdom Plantae that includes the most "primitive" of the vascular plants. All member species reproduce by shedding spore and macroscopic alternation of generations, but some are homosporous and some are heterosporous. All have simple leaves.

There are three main groups in the Lycophyta, sometimes divided at the order level and sometimes at the class level. They are divided at the class level here:

• class Lycopsida: clubmosses
• class Selaginellopsida[?]: spikemosses
• class Isoötopsida[?]: quillworts