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; No higher resolution available. Cooksonia.png (300 × 400 pixels, file size: 45 KB, MIME type: image/png) ... Cooksonia, vanhin tunnettu putkilokasvi. Kuva: Ville Koistinen ... Cooksonia a primitive vascular plant from the Silurian period...
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en.wikipedia.org/wiki/File:Cooksonia.png
en.wikipedia.org/wiki/File:Cooksonia.png
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Description of the oldest land plant: Cooksonia. ... Cooksonia, a very old land plant ... Finding Cooksonia-fossils is difficult because only a few occurrences are known (marine, delta of river deposits from the Late Silurian and the earliest Devonian). The small size of the plant is also a disadvantage for finding.
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www.xs4all.nl/~steurh/engcook/ecooks.html
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The earliest well-known plant, which flourished during the late Silurian and early Devonian is called Cooksonia. It is named after Isabel Cookson, who occupied herself with intensive collecting and describing plant fossils.
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www.palaeos.com/Plants/Tracheophyta/Cooksonia.html
www.palaeos.com/Plants/Tracheophyta/Cooksonia.html
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A cartoon reconstruction of Cooksonia pertoni. The stems have been reconstructed as non-photosynthetic, according to Boyce (2008). The axes are imagined to be around 100μm in diameter. It is left to the viewer's imagination whether or not the thallus is associated with the Cooksonia axes!
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commons.wikimedia.org/wiki/File:Cooksonia_pertoni.png
commons.wikimedia.org/wiki/File:Cooksonia_pertoni.png
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Cooksonia, vanhin tunnettu putkilokasvi. Kuva: Ville Koistinen ... Cooksonia a primitive vascular plant from the Silurian period ... Usage of Cooksonia.png on cswiki...
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commons.wikimedia.org/wiki/File:Cooksonia.png
commons.wikimedia.org/wiki/File:Cooksonia.png
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THE late Silurian–early Devonian genus Cooksonia, characterized by smooth isotomously branching axes and solitary, terminal sporangia1, has long been regarded as the archetypal vascular plant because of its age and simplicity of organization.
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www.nature.com/nature/journal/v357/n6380/abs/357683a0.h...
www.nature.com/nature/journal/v357/n6380/abs/357683a0.html
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Size of plant 3.7 cms...
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www.biologie.uni-hamburg.de/b-online/library/steur/eng/...
www.biologie.uni-hamburg.de/b-online/library/steur/eng/caled.html
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The best known plant from that time is called Cooksonia. It is named after Isabel Cookson, who occupied herself with intensive collecting and describing plantfossils. The little plant looked very simple: a stem which bifurcated a couple of times topped with small spheres in which the spores were formed.
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www.biologie.uni-hamburg.de/b-online/library/steur/eng/...
www.biologie.uni-hamburg.de/b-online/library/steur/eng/old1.html
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Only the sporophyte phase of Cooksonia is currently known. Individuals were small, a few centimetres tall, and had a simple structure; they lacked leaves, flowers and roots — although it has been speculated that they grew from an unpreserved rhizome.
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www.absoluteastronomy.com/topics/Cooksonia
www.absoluteastronomy.com/topics/Cooksonia
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