- International Fossil Algae Association
- Nonprofit organization created to promote the study of fossil algae taxonomy, morphology, biology, biostratigraphy, paleo-ecology, and mineralization.
- International Organisation of Palaeobotany
- Palaeobotany and palaeo-palynology organization promoting international cooperation in the study of fossil plants or ancient plant remains.
- International Work Group for Palaeoethnobotany (IWGP)
- Group concerned with the study of plant remains preserved on, or in association with, archaeological sites.
- Paleobotanical Section of the Botanical Society of America
- Overview of the organization with news, a bibliography of American Paleobotany, meeting information, and announcements.
- Westfälische Wilhelms University Paleobotany Research Group
- Undertakes research on the late Palaeozoic and early Mesozoic floras. Aims to gather better insights on the natural relationships between various extinct groups of fossil plants.
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