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Permian
Paraguay
(Dernbach Collection)
The pink circular structure in the upper left is the trunk or stem, in which vascular bundles encircle the light pink inner pith (central soft tissue) of the stem. The horseshoe-shaped structures in the remainder of the picture are the veins in the bases of the leaves, and the small dots are roots. This plant was a fern very much like the present-day Osmunda.