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Glossopteris Stem
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| The
stems and trunks of many seed ferns consisted of separate
vascular segments in the form of wedges, which formed a polystele. Glossopteris is
a seed fern with a eustele vascular bundle (concentric vascular
bundles with enclosed pith), which is characteristic of conifers
and angiosperms. The
polystele and eustele wood of seed fern stems was composed of conifer-like
wood. |