Huvenia kleui
| Huvenia kleui | ||||||||||||
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| Temporal occurrence | ||||||||||||
| Early Devonian ( Pragium ) | ||||||||||||
| 411 to 407 million years | ||||||||||||
| Locations | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name of the genus | ||||||||||||
| Huvenia | ||||||||||||
| H. Hass & W. Remy | ||||||||||||
| Scientific name of the species | ||||||||||||
| Huvenia kleui | ||||||||||||
| H. Hass & W. Remy |
Huvenia kleui is an extinct plant species. It is known from the Devonian of Germany and is one of the basic representatives of vascular plants . It is the only species in the Huvenia genus.
features
The main axes branch in the same way (isotomically) two or three forks. The axes are mostly smooth, some have multicellular spines or small, hemispherical outgrowths.
The sporangia stand individually at different points along the main axes on small, unbranched or dichotomous side axes that are provided with vascular bundles. These lateral axes can be so short that the sporangia appear sessile. The fertile side branches can also appear grouped. The sporangia are spindle-shaped and have pointed ends. They open with several screw-like slots.
Anatomical information is scarce due to the poor state of conservation of the fossils. The central vascular bundle consists at least partly of spirally thickened cells, the wall of which is of the S-type. Stomata and spores are not known.
The gametophyte probably corresponds to the forms described as the Sciadophyton .
distribution
Huvenia kleui is known from the Rhenish Slate Mountains in Germany. The find layers are dated to the early Devonian ( Pragian ).
supporting documents
- Paul Kenrick, Peter R. Crane: The Origin and Early Diversification of Land Plants. A Cladistic Study . Smithsonian Institution Press, Washington DC 1997, pp. 322f. ISBN 1-56098-729-4
further reading
- H. Hass, W. Remy: Huvenia kleui nov.gen., Nov.spec., A representative of the Rhyniaceae from the higher Siegen of the Rhenish Slate Mountains . Argumenta Palaeobotanica, Volume 8, 1991, pp. 141-168.