Hamatophyton verticillatum

Hamatophyton verticillatum; Temporal range: Famennian–Tournaisian PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Plantae
Division:	Pteridophyta
Class:	Equisetopsida
Order:	†Sphenophyllales
Genus:	†Hamatophyton
Species:	H. verticillatum
Binomial name
	†Hamatophyton verticillatum;

Hamatophyton verticillatum is a species of the extinct Sphenophyllales horsetails.^[1]

Description

Axes of this plant are pseudomonopodial with axial trichomes or spines and nodal whorls of sterile leaves. Leaves are dimorphic and sometimes contain trichomes or spines. When mature, primary xylem is exarch and the secondary xylem lacks parenchyma.

References

^ Thomas N. Taylor, Edith L. Taylor, Michael Krings: Paleobotany. The Biology and Evolution of Fossil Plants . Second Edition, Academic Press 2009, ISBN 978-0-12-373972-8 , p. 333

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[1] Thomas N. Taylor, Edith L. Taylor, Michael Krings: Paleobotany. The Biology and Evolution of Fossil Plants . Second Edition, Academic Press 2009, ISBN 978-0-12-373972-8 , p. 333

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