The Division Lycophyta is a tracheophyte subdivision of the Kingdom Plantae that includes some of the most "primitive" of extant (living) vascular plants. These species reproduce by shedding spores and have macroscopic alternation of generations, although some are homosporous while others are heterosporous. All have simple leaves.
There are three main groups within the Lycophyta, sometimes separated at the level of order and sometimes at the level of class. These are subdivided at the class level here: