Published June 4, 2026
| Version v1
Taxonomic treatment
Open
Equisetum undetermined
Authors/Creators
- 1. Swedish Museum of Natural History, Department of Palaeobiology, Stockholm, Sweden
- 2. University of Vienna, Department of Botany and Biodiversity Research, Vienna, Austria & AZ Pollen Research (AZPR), Stockerau, Austria
- 3. Department of Geography and Regional Science, University of Graz, Graz, Austria
- 4. Department of Geology and Palaeontology, Universalmuseum Joanneum, Graz, Austria
Description
Equisetum sp.
Fig. 2 A
Specimen.
UMJ 80006, UMJ 80230.
Description.
Cross-section of rhizome axis with four tubers arranged in a whorl, c. 10 mm long and 3–5 mm wide, with a few longitudinal ridges (Fig. 2 A).
Discussion.
Tubers on rhizomes of Equisetum are frequently found in Cenozoic strata across the Northern Hemisphere and are among the most common fossil macro-remains of horsetails (e. g., Aung et al. 2020). In addition, one poorly preserved specimen (UMJ 80006) might represent an unbranched stem of Equisetum with nodes bearing whorled, connate, scale-like leaves forming nodal sheaths.
Notes
Published as part of Denk, Thomas, Bouchal, Johannes M., Dirr, Lukas, Nickel, Simon & Gross, Martin, 2026, The late Middle Miocene (late Sarmatian) flora of Graz-Andritz (Austria): Environmental, climatic, and biogeographic patterns, pp. 333-372 in Fossil Record 29 (1) on pages 333-372, DOI: 10.3897/fr.29.187793
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Linked records
Additional details
Identifiers
Biodiversity
- Kingdom
- Plantae
- Phylum
- Tracheophyta
- Order
- Equisetales
- Family
- Equisetaceae
- Genus
- Equisetum
- Species
- undetermined
- Taxon rank
- species
References
- Aung AT, Huang J, Do TV, Song A, Liu J, Zhou Z – K, Su T (2020) Three new fossil records of Equisetum (Equisetaceae) from the Neogene of south-western China and northern Vietnam. In: Jin X – H, Xia N – H, Tan Y – H (Eds) Plant Diversity of Southeast Asia-II. PhytoKeys 138: 3–15. https://doi.org/10.3897/phytokeys.138.38674