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Permian:
299-251 Million Years Ago
Gallery: Paraguay, South America
Gallery: Paraguay, South America
 Tree Fern Guairea carnieri Paraguay, South America 20 cm x 12.5 cm |
| In the image below one can see a close-up of the vascular ring enclosing the central pith. U-shaped leaf traces are scattered within the surrounding cortex. |
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| A close-up of the U-shaped leaf traces within the cortex are pictured below. |
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| The cortex is surrounded by a mantle of roots. The transition zone between the cortex and root mantle is pictured below. |
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