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8.txt
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2001-04-13
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441b
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15 lines
A cross section through the stems of club mosses and horsetails reveals
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their primitive vascular systems.
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Lycopodium
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has a central cylinder which
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contains lobes of xylem interspersed with phloem.
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Equisetum
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has a hollow
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stem ringed by small xylem and phloem bundles.