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Unformatted text preview: Lepidodendron was a heterosporous tree common in coal swamps. As with many large plant fossils, one rarely if ever finds the entire tree preserved intact. Consequently there are a number of fossil plant genera that are "organ taxa" and represent only the leaves (such as Lepidophylloides ), reproductive structures ( Lepidostrobus ), stem ( Lepidodendron ), spores ( Lycospora ), and roots ( Stigmaria ). Lepidodendron had leaves borne spirally on branches that dichotomously forked, with roots also arising spirally from the stigmarian axes, and both small (microspores) and large (megaspores) formed in strobili (a loose type of soft cone). Taylor and Taylor (1993) note that Lepidodendron reached nearly 40 meters in height, with trunks nearly 2 meters in diameter. The trees branched extensively and produced a large number of leaves. that, when they fell from the branches, produced the characteristic leaf scars of the genus....
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