1. Delicate fern widely distributed in North America and European having thin pinnatifid fronds with brittle stems
   - brittle bladder fern, brittle fern, fragile fern

Type of: bladder fern

• genus Pseudowintera
• genus Psidium
• genus Psilophyton
• genus Psilotum
• genus Psithyrus
• genus Psittacosaurus
• genus Psittacula
• genus Psittacus
• genus Psophia
• genus Psophocarpus
• genus Psoralea
• genus Psychopsis
• genus Psychotria
• genus Pteretis
• genus Pteridium
• genus Pteris
• genus Pternohyla
• genus Pterocarpus
• genus Pterocarya
• genus Pterocles
• genus Pterocnemia
• genus Pterodactylus
• genus Pterois
• genus Pteropogon
• genus Pteropus