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nountrue (leptosporangiate) fernstype of:
Definition that contains filicales
- pteridospermaphyta used in some classification systems: a group of extinct fossil gymnosperms coextensive with the order Cycadofilicales
- family gleicheniaceae a family of ferns belonging to order Filicales
- leptosporangium a sporangium formed from a single epidermal cell; characteristic of the Filicales or of almost all modern ferns
- seed fern an extinct seed-producing fernlike plant of the order Cycadofilicales (or group Pteridospermae)
- gleicheniaceae a family of ferns belonging to order Filicales
- pteridosperm an extinct seed-producing fernlike plant of the order Cycadofilicales (or group Pteridospermae)
- group pteridospermae used in some classification systems: a group of extinct fossil gymnosperms coextensive with the order Cycadofilicales
- pteridospermae used in some classification systems: a group of extinct fossil gymnosperms coextensive with the order Cycadofilicales
- group pteridospermaphyta used in some classification systems: a group of extinct fossil gymnosperms coextensive with the order Cycadofilicales