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Genus Pellaea
- genus of chiefly small rock-loving ferns; in some classification systems it is placed in the family Polypodiaceae or Adiantaceae
Genus Pityrogramma
- terrestrial tropical ferns having fronds with powdery yellowish or white undersides; sometimes placed in family Polypodiaceae or Adiantaceae
Genus Pteris
- large genus of terrestrial ferns of tropics and subtropics; sometimes placed in family Polypodiaceae
Genus Marattia
- type genus of the Marattiaceae: ferns having the sporangia fused together in two rows
Genus Danaea
- fairly small terrestrial ferns of tropical America
Genus Psilotum
- type genus of the Psilotaceae
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