class - (biology) a taxonomic group containing one or more orders

division Pteridophyta, Pteridophyta - containing all the vascular plants that do not bear seeds: ferns, horsetails, club mosses, and whisk ferns; in some classifications considered a subdivision of Tracheophyta

class Lycopodineae, Lycopodineae - alternative designation for the class Lycopsida

club moss, club-moss, lycopod - primitive evergreen mosslike plant with spores in club-shaped strobiles

Lepidodendrales, order Lepidodendrales - fossil arborescent plants arising during the early Devonian and conspicuous throughout the Carboniferous

Lycopodiales, order Lycopodiales - lower vascular plants coextensive with the family Lycopodiaceae; in some classifications includes the Selaginellaceae and Isoetaceae

order Selaginellales, Selaginellales - in some classifications included in Lycopodiales

Isoetales, order Isoetales - aquatic or marsh-growing fern allies; known to have existed since the Cenozoic; sometimes included in Lycopodiales