How many living lycophyte species are there?

There are more than 1,200 extant (living) species of lycophytes (class Lycopodiopsida).1

These vascular plants are categorized into three living orders:
* Club mosses (Lycopodiales)
* Spike mosses (Selaginellales)
* Quillworts and their allies (Isoetales)12

While modern lycophytes are exclusively small herbaceous plants, they are the survivors of a group that was once much more diverse, including massive, tree-like species that dominated forests during the Carboniferous Period.12