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Equisetum magnum
Equisetum magnum L.J. Hickey Mem. Geol. Soc. Amer., 150: 105. 19 Jul 1977
- Name
- Equisetum magnum
- Rank
- Species
- Generic Name
- [Genus] Equisetum
- Authors (Pub.)
- Hickey L. J.
- Publication
- Stratigraphy and paleobotany of the Golden Valley Formation (Early Tertiary) of Western North Dakota [1977/7]
- Journal
- Memoirs of the Geological Society of America
- Volume
- 150
- Page number
- 105
- Year
- 1977
- Fossil Status
- rhizomata
- Stratigraphy
- Thanetian
- Location
- Head of Otter Creek, Oliver County, Vermont, USA
- Paleoregion
- America (North)
Data for Holotypus
- Repository
- National Museum of Natural History, Smithsonian Institution, Washington, USA
- Repository Number
- USNM 43744
Data for Paratypus
- Repository
- National Museum of Natural History, Smithsonian Institution, Washington, USA
- Repository Number
- 43161, 43162, 43742, 43743, 43745; PU (Princeton University) 20055, 20056
- Diagnosis
- Rhizome and main stem sections large; diameter, as estimated from flattened compressions, 1 to 1.8 cm; with 30 to 60 ridges; marked with irregularly distributed impressions of silica tubercules; stomata roughly aligned in 3 to 4 rows on the flanks of the grooves; nodal sheaths present, apparently shorter than broad, / 7 to 13 mm, w 1 to 1.8 cm; l/w ratio 0.73; shape cylindrical on the larger stems to swollen or tulip-shaped on the lateral
branches; teeth firm and persistent, acute to somewhat acuminate, 1 to 3 mm long; ratio of ridge number to stem diameter 3; whorl of branchlet scars present just below the sheath; lateral branches with at least 8 ridges and long internodes (43 mm).
