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Unformatted text preview: in such a way that one branch appeared to be the central stem and the other a side shoot. The Lycophytes Plants belonging to the division Lycophyta, have their sporangia organized into strobili (sing.: strobilus). Leaves that contained vascular tissue are another major advance for this group. The major fossil groups of lycophytes are the lepidodendrids and sigillarids, often referred to as the arborescent lycopods because they usually were large trees. During the middle Devonian lycophytes retaind their herbaceous habit, but also began to grow taller, more than a few meters high at first, and developed the capability for secondary growth to produce wood , allowing the plants to grow still taller. Modern lycophytes lack secondary growth and are entirely herbaceous....
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