Hamatophyton verticillatum is a species of the extinct Sphenophyllales horsetails.[3]
| Hamatophyton verticillatum Temporal range:
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|---|---|
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]
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| Synonyms[1][2] | |
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Description edit
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 edit
- ^ a b "Hamatophyton verticillata". International Fossil Plant Names Index. Retrieved 2024-02-24.
- ^ "Sphenophyllostachys verticillata". International Fossil Plant Names Index. Retrieved 2024-02-24.
- ^ a b 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.
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