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Jurassic
Lune River, Tasmania, Australia
(Dernbach Collection)
This is a cross-section of the "false trunk" of a tree fern. The circle at the top is made up of individual bundles of wood in the stem itself. Surrounding it are small circular areas that are the individual leaf bases, each of which contains a little horseshoe-shaped vascular strand that supplied water and nutrients to the leaf. The smallest circular structures are the roots of the fern, which are interspersed among the larger leaf bases.