Lepidodendron - Lepidodendron and Sigillaria The Lycophytes...

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Lepidodendron and Sigillaria The Lycophytes became significant elements of the world's flora during the Carboniferous time (the Mississippian and Pennsylvanian are terms used for this time span in the United States). These non-seed plants evolved into trees placed in the fossil genera Lepidodendron and Sigillaria, with heights reaching up to 40 meters and 20-30 meters respectively. Lepidodendron stems are composed of less wood (secondary xylem) that usually is found in gymnosperm and angiosperm trees. We know much about the anatomy of these coal-age lycopods because of an odd type of preservation known as a coal ball. Coal balls can be peeled and the plants that are anatomically preserved within them laboriously studied to learn the details of cell structure of these coal age plants. Additionally, we have some exceptional petrifactions and compressions that reveal different layers of the plants' structure. Estimates place the bulk, up to 70%, of coal material as being derived from
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Lepidodendron - Lepidodendron and Sigillaria The Lycophytes...

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