<P> The branches of this plant ended in cone - structures . Lepidodendron did not produce true seeds like many modern plants . Instead, it reproduced by means of elaborate, encapsulated spores . It is estimated that these plants grew rapidly and lived 10--15 years . Most species were probably monocarpic, meaning they reproduced only once toward the end of their life . </P> <P> By the Mesozoic era, the giant lycopsids had died out and were replaced by conifers as well as smaller Quillworts . This may have been the result of competition from the emerging woody gymnosperms . Lepidodendron is one of the more common plant fossils found in Pennsylvanian (Late Carboniferous) age rocks . They are closely related to other extinct Lycopsid genera, Sigillaria and Lepidendropsis . </P> <Table> <Tr> <Td> </Td> <Td> This section needs expansion . You can help by adding to it . (May 2012) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This section needs expansion . You can help by adding to it . (May 2012) </Td> </Tr>

What is the relationship between lepidodendron and electric lights