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Updated: May 27, 2025
Williamson said that what had formerly been regarded as such had turned out to be only casts in sand and mud of the pith of the true plant. He had lately obtained a specimen of calamite with the bark on which showed a nucleal cellular pith, surrounded by canals running lengthwise down the stem; outside of these canals wedges of true vascular structure; and lastly, a cellular bark.
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