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Genus Psilophyton
- type genus of the Psilophytaceae: genus of small wiry herbaceous Paleozoic plants with underground rhizomes and apical sporangia
Genus Rhynia
- type genus of the Rhyniaceae; small leafless dichotomously branching fossil plants with terminal sporangia and smooth branching rhizomes
Genus Horneophyton
- Devonian fossil plant considered one of the earliest forms of vascular land plants; similar to genus Rhynia but smaller
Genus Equisetum
- horsetails; coextensive with the family Equisetaceae
Genus Lycopodium
- type and sole genus of the Lycopodiaceae; erect or creeping evergreen plants often used for Christmas decorations
Genus Selaginella
- type and sole genus of the Selaginellaceae; evergreen mosslike plants: spike moss and little club moss
Genus Isoetes
- type and genus of the Isoetaceae and sole extant genus of the order Isoetales
Genus Geoglossum
- type genus of the Geoglossaceae comprising the earthtongues
Genus Thelypteris
- marsh ferns: in some classification systems considered part of genus Dryopteris in family Dryopteridaceae
Genus Amauropelta
- epiphytic or terrestrial ferns of America and Africa and Polynesia