Lycopod prehistoric plants from the Carboniferous Period (360 to 286 million years ago), historical artwork. At left is an example of Lepidodendron, a giant clubmoss that grew to be over 30 metres tall. Its patterned outer surface formed fossils such as the one at left. At right is an example of Sigillaria, another giant plant that formed tall straight trunks. Its fossil impression is also shown to its left. Both plants reproduced by means of spores, and are now extinct. The labels are in French. Artwork from the third edition of 'Les Entrailles de la Terre' (1902) by French author Eugene Caustier.