Specimens of Sigillaria from Marles-les-mines, Pas-de-Calais, France. They have been dated to the Carboniferous period, Westphalian. Sigillaria is an extinct genus of tree-like plants which lived between the late Carboniferous and early Permian period, it could reach heights of up to 30 meters and had a tall single trunk that would occasionally be forked. Sigillaria did not reproduce with seeds but instead reproduced using spores of two sizes, macrospores which producing eggs and microspores to produce sperm cells. These samples would be ideal for educational use, they are supplied in a white card tray with an information label.