Hamatophyton verticillatum

Hamatophyton verticillatum is a species of the extinct Sphenophyllales horsetails.^[3]

Hamatophyton verticillatum Temporal range: Famennian–Tournaisian PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Division:	Polypodiophyta
Class:	Polypodiopsida
Subclass:	Equisetidae
Order:	†Sphenophyllales
Genus:	†Hamatophyton
Species:	†H. verticillatum
Binomial name
†Hamatophyton verticillatum L.-H. Deng, X.-X. Li, Z.-Y. Zhou, R. Xu, J.-N. Zhu, nom. inval.[1]
Synonyms[1][2]
Sphenophyllostachys verticillata (L.-H. Deng, X.-X. Li, Z.-Y. Zhou, R. Xu, J.-N. Zhu) S.-N. Feng, J. Ma, nom. inval.

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.^[3]

References

1. "Hamatophyton verticillata". International Fossil Plant Names Index. Retrieved 2024-02-24.
2. "Sphenophyllostachys verticillata". International Fossil Plant Names Index. Retrieved 2024-02-24.
3. Taylor, T.N.; Taylor, E.L. & Krings, M. (2009). Paleobotany, The Biology and Evolution of Fossil Plants (2nd ed.). Amsterdam; Boston: Academic Press. ISBN 978-0-12-373972-8.