File:Archaeopteris cf. Archaeopteris halliana fossil land plant (Devonian; Quebec, Canada) 1 (15518557911).jpg
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[edit]DescriptionArchaeopteris cf. Archaeopteris halliana fossil land plant (Devonian; Quebec, Canada) 1 (15518557911).jpg |
Archaeopteris cf. Archaeopteris halliana fossil land plant from the Devonian of Quebec, southeastern Canada. (public display, FMNH PP16302, Field Museum of Natural History, Chicago, Illinois, USA) Plants are multicellular, photosynthetic eucaryotes. The oldest known land plant body fossils are Silurian in age. Fossil root traces of land plants are known back in the Ordovician. The Devonian was the key time interval during which land plants flourished and Earth experienced its first “greening” of the land. The earliest land plants were small and simple and probably remained close to bodies of water. By the Late Devonian, land plants had evolved large, tree-sized bodies and the first-ever forests appeared. This fossil branch with leaves is from a progymnosperm, an extinct group of vascular plants. Progymnosperms have characteristics of seed plants (they have lots of gymnosperm-like wood - secondary xylem) and characteristics of ferns (fern-like reproductive structures that produce spores). In the 1960s, the leaf/frond genus Archaeopteris was recognized to be part of the same plant as the wood genus Callixylon. Archaeopteris had 3 to 4 feet diameter trunks (axes) and formed shrubby to tree-sized plants, possibly similar to modern conifers. The leaves (they are recognized as true leaves in this form) are flattened and range in shape from spatulate to fan-shaped to dissected. Species of Archaeopteris have been reported from the Devonian of North America, Eurasia, and Australia. Classification: Plantae, Progymnospermophyta, Archaeopteridales |
Date | |
Source | Archaeopteris cf. Archaeopteris halliana fossil land plant (Devonian; Quebec, Canada) 1 |
Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/15518557911. It was reviewed on 6 May 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
6 May 2015
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Date and time of data generation | 11:29, 11 June 2010 |
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File change date and time | 21:44, 12 October 2014 |
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Exif version | 2.21 |
Date and time of digitizing | 11:29, 11 June 2010 |
Meaning of each component |
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APEX exposure bias | 0 |
Maximum land aperture | 4.7 APEX (f/5.1) |
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Date metadata was last modified | 17:44, 12 October 2014 |