A Fossil Equisetum Sp. (Family Equisetaceae, Subgenus Hippochaetae) From the Late Tertiary Ash Hollow Formation of Nebraska

Thomasson, Joseph R.

doi:10.1002/j.1537-2197.1980.tb07631.x

Cited by 11 publications

(4 citation statements)

References 5 publications

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“…(2020) Equisetum sp. America Leaf-sheaths Thomasson (1980) E . oregonense America Stem and leaf sheaths Knowlton (1902) Equisetum sp .…”

Section: Discussionmentioning

confidence: 99%

“…of ridges Leaf sheath length (mm) Leaf teeth number in the leaf sheath Leaf sheath shape Size of teeth Length (mm) Width (mm) Equisetum sp. (Subgenus: Hippochaete ) – – – – Fragmentary (2–4) – 2.4–3.5 mm 0.5– 0.6 mm Bar-shaped thickenings surrounding stomatal openings; sunken stomata arranged in two regular rows on the flanks of each segment and by the massive development of sheath ornamentation Thomasson (1980) E . oregonense 30 mm – – – – Obtuse dentation – – – Knowlton (1902) Equisetum sp.…”

Section: Discussionmentioning

confidence: 99%

“…Our use of fluorescence microscopy allows us to compare the epidermal features of our specimens to those of previously discovered Equisetum fossils, although to date epidermal anatomy has only been characterized in two fossil species of Equisetum ( Brown, 1975 ; Thomasson, 1980 ). One species, Equisetum sp., was reported by Thomasson (1980) from the Ash Hollow Formation (Late Miocene to Pliocene) and the other species, E. clarnoi , from Clarno Chert Formation, Oregon (Middle Eocene) of North America ( Brown, 1975 ). Our specimens represent the first authentic record of Equisetum specimens with epidermal anatomy from Asia.…”

Section: Discussionmentioning

confidence: 99%

“…(2021) . For descriptions of epidermal anatomy, we follow the terms of Thomasson (1980) and Brown (1977) . We compared current fossils with modern species of Equisetum using digital herbarium catalogues, viz., (Kew herbarium catalogue.…”

Section: Methodsmentioning

confidence: 99%

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Evidence of the oldest extant vascular plant (horsetails) from the Indian Cenozoic

et al. 2023

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“…(2020) Equisetum sp. America Leaf-sheaths Thomasson (1980) E . oregonense America Stem and leaf sheaths Knowlton (1902) Equisetum sp .…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Evidence of the oldest extant vascular plant (horsetails) from the Indian Cenozoic

et al. 2023

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Carex Graceii Sp. N., Cyperocarpus Eliasii Sp. N., Cyperocarpus Terrestris Sp. N., and Cyperocarpus Pulcherrima Sp. N. (Cyperaceae) From the Miocene of Nebraska

Thomasson

1983

American J of Botany

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Silicified achenes and some perigynia of four new sedges are described from the late middle or late Miocene Ash Hollow (Clarendonian or Hemphillian) and early middle Miocene Sheep Creek (Late Hemingfordian) Formations of Nebraska. Carex graceii, sp. n., Cyperocarpus terrestris, sp. n., and Cyperocarpus pulcherrima, sp. n., were collected from strata in Garden and Antelope Counties and Cyperocarpus eliasii, sp. n., was collected from strata in Sioux County. Certain of the newly discovered taxa exhibit considerable anatomical detail of the pericarp wall of the achene. In two taxa, Carex graceii and Cyperocarpus pulcherrima, the achene pericarp exhibits four topographic regions: a cuticle, an outer layer of pentagonally to hexagonally shaped epidermal cells containing silica bodies, a middle layer of sclerenchyma cells, and an inner layer of sclerenchyma cells whose long axes are perpendicular to the long axes of the cells of the middle layer. Similar pericarp anatomy was found in Cyperocarpus terrestris except that the inner layer was not observed. In the fourth taxon, Cyperocarpus eliasii, only an outer epidermal layer of elongate cells with small protuberances is preserved. The ultrastructure of the pericarp of the fossil taxa is similar to that of living forms. Associated flora and fauna indicate widespread savanna environments with significant riparian elements. This is the first systematic treatment of sedges from the Miocene of North America.

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Using phytolith assemblages to reconstruct the origin and spread of grass-dominated habitats in the great plains of North America during the late Eocene to early Miocene

Strömberg

2004

Palaeogeography, Palaeoclimatology, Palaeoecology

293

195

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A Fossil Equisetum Sp. (Family Equisetaceae, Subgenus Hippochaetae) From the Late Tertiary Ash Hollow Formation of Nebraska

Cited by 11 publications

References 5 publications

Evidence of the oldest extant vascular plant (horsetails) from the Indian Cenozoic

Evidence of the oldest extant vascular plant (horsetails) from the Indian Cenozoic

Carex Graceii Sp. N., Cyperocarpus Eliasii Sp. N., Cyperocarpus Terrestris Sp. N., and Cyperocarpus Pulcherrima Sp. N. (Cyperaceae) From the Miocene of Nebraska

Using phytolith assemblages to reconstruct the origin and spread of grass-dominated habitats in the great plains of North America during the late Eocene to early Miocene

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