The Virtual Petrified Wood Museum.  Dedicated to the Exhibition and Educational Study of Permineralized Plant Material
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Glossopteris Stem
The stems and trunks of many seed ferns consisted of separate vascular segments in the form of wedges, which formed a single stele with a polyvascular arrangement. Glossopteris is a seed fern with a eustele vascular bundle (concentric vascular bundles with enclosed pith), which is characteristic of conifers and angiosperms.  The wood of seed fern stems was composed of conifer-like wood.

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